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libraries/spcre/libpcre/pcre/doc/html/pcretest.html
author Tom Sutcliffe <thomas.sutcliffe@accenture.com>
Wed, 23 Jun 2010 15:52:26 +0100
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<html>
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<head>
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<title>pcretest specification</title>
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</head>
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<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
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<h1>pcretest man page</h1>
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<p>
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Return to the <a href="index.html">PCRE index page</a>.
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</p>
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<p>
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This page is part of the PCRE HTML documentation. It was generated automatically
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from the original man page. If there is any nonsense in it, please consult the
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man page, in case the conversion went wrong.
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<br>
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<ul>
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<li><a name="TOC1" href="#SEC1">SYNOPSIS</a>
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<li><a name="TOC2" href="#SEC2">OPTIONS</a>
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<li><a name="TOC3" href="#SEC3">DESCRIPTION</a>
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<li><a name="TOC4" href="#SEC4">PATTERN MODIFIERS</a>
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<li><a name="TOC5" href="#SEC5">DATA LINES</a>
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<li><a name="TOC6" href="#SEC6">THE ALTERNATIVE MATCHING FUNCTION</a>
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<li><a name="TOC7" href="#SEC7">DEFAULT OUTPUT FROM PCRETEST</a>
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<li><a name="TOC8" href="#SEC8">OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION</a>
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<li><a name="TOC9" href="#SEC9">RESTARTING AFTER A PARTIAL MATCH</a>
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<li><a name="TOC10" href="#SEC10">CALLOUTS</a>
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<li><a name="TOC11" href="#SEC11">NON-PRINTING CHARACTERS</a>
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<li><a name="TOC12" href="#SEC12">SAVING AND RELOADING COMPILED PATTERNS</a>
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<li><a name="TOC13" href="#SEC13">SEE ALSO</a>
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<li><a name="TOC14" href="#SEC14">AUTHOR</a>
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<li><a name="TOC15" href="#SEC15">REVISION</a>
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</ul>
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<br><a name="SEC1" href="#TOC1">SYNOPSIS</a><br>
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<P>
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<b>pcretest [options] [source] [destination]</b>
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<br>
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<br>
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<b>pcretest</b> was written as a test program for the PCRE regular expression
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library itself, but it can also be used for experimenting with regular
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expressions. This document describes the features of the test program; for
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details of the regular expressions themselves, see the
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<a href="pcrepattern.html"><b>pcrepattern</b></a>
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documentation. For details of the PCRE library function calls and their
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options, see the
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<a href="pcreapi.html"><b>pcreapi</b></a>
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documentation.
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</P>
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<br><a name="SEC2" href="#TOC1">OPTIONS</a><br>
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<P>
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<b>-b</b>
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Behave as if each regex has the <b>/B</b> (show bytecode) modifier; the internal
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form is output after compilation.
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</P>
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<P>
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<b>-C</b>
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Output the version number of the PCRE library, and all available information
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about the optional features that are included, and then exit.
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</P>
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<P>
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<b>-d</b>
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Behave as if each regex has the <b>/D</b> (debug) modifier; the internal
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form and information about the compiled pattern is output after compilation;
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<b>-d</b> is equivalent to <b>-b -i</b>.
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</P>
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<P>
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<b>-dfa</b>
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Behave as if each data line contains the \D escape sequence; this causes the
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alternative matching function, <b>pcre_dfa_exec()</b>, to be used instead of the
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standard <b>pcre_exec()</b> function (more detail is given below).
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</P>
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<P>
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<b>-help</b>
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Output a brief summary these options and then exit.
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</P>
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<P>
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<b>-i</b>
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Behave as if each regex has the <b>/I</b> modifier; information about the
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compiled pattern is given after compilation.
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</P>
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<P>
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<b>-m</b>
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Output the size of each compiled pattern after it has been compiled. This is
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equivalent to adding <b>/M</b> to each regular expression. For compatibility
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with earlier versions of pcretest, <b>-s</b> is a synonym for <b>-m</b>.
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</P>
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<P>
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<b>-o</b> <i>osize</i>
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Set the number of elements in the output vector that is used when calling
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<b>pcre_exec()</b> or <b>pcre_dfa_exec()</b> to be <i>osize</i>. The default value
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is 45, which is enough for 14 capturing subexpressions for <b>pcre_exec()</b> or
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22 different matches for <b>pcre_dfa_exec()</b>. The vector size can be
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changed for individual matching calls by including \O in the data line (see
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below).
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</P>
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<P>
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<b>-p</b>
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Behave as if each regex has the <b>/P</b> modifier; the POSIX wrapper API is
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used to call PCRE. None of the other options has any effect when <b>-p</b> is
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set.
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</P>
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<P>
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<b>-q</b>
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Do not output the version number of <b>pcretest</b> at the start of execution.
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</P>
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<P>
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<b>-S</b> <i>size</i>
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On Unix-like systems, set the size of the runtime stack to <i>size</i>
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megabytes.
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</P>
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<P>
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<b>-t</b>
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Run each compile, study, and match many times with a timer, and output
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resulting time per compile or match (in milliseconds). Do not set <b>-m</b> with
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<b>-t</b>, because you will then get the size output a zillion times, and the
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timing will be distorted. You can control the number of iterations that are
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used for timing by following <b>-t</b> with a number (as a separate item on the
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command line). For example, "-t 1000" would iterate 1000 times. The default is
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to iterate 500000 times.
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</P>
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<P>
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<b>-tm</b>
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This is like <b>-t</b> except that it times only the matching phase, not the
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compile or study phases.
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</P>
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<br><a name="SEC3" href="#TOC1">DESCRIPTION</a><br>
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<P>
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If <b>pcretest</b> is given two filename arguments, it reads from the first and
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writes to the second. If it is given only one filename argument, it reads from
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that file and writes to stdout. Otherwise, it reads from stdin and writes to
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stdout, and prompts for each line of input, using "re&#62;" to prompt for regular
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expressions, and "data&#62;" to prompt for data lines.
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</P>
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<P>
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When <b>pcretest</b> is built, a configuration option can specify that it should
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be linked with the <b>libreadline</b> library. When this is done, if the input
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is from a terminal, it is read using the <b>readline()</b> function. This
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provides line-editing and history facilities. The output from the <b>-help</b>
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option states whether or not <b>readline()</b> will be used.
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</P>
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<P>
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The program handles any number of sets of input on a single input file. Each
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set starts with a regular expression, and continues with any number of data
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lines to be matched against the pattern.
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</P>
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<P>
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Each data line is matched separately and independently. If you want to do
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multi-line matches, you have to use the \n escape sequence (or \r or \r\n,
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etc., depending on the newline setting) in a single line of input to encode the
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newline sequences. There is no limit on the length of data lines; the input
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buffer is automatically extended if it is too small.
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</P>
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<P>
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An empty line signals the end of the data lines, at which point a new regular
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expression is read. The regular expressions are given enclosed in any
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non-alphanumeric delimiters other than backslash, for example:
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<pre>
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  /(a|bc)x+yz/
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</pre>
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White space before the initial delimiter is ignored. A regular expression may
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be continued over several input lines, in which case the newline characters are
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included within it. It is possible to include the delimiter within the pattern
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by escaping it, for example
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<pre>
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  /abc\/def/
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</pre>
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If you do so, the escape and the delimiter form part of the pattern, but since
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delimiters are always non-alphanumeric, this does not affect its interpretation.
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If the terminating delimiter is immediately followed by a backslash, for
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example,
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<pre>
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  /abc/\
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</pre>
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then a backslash is added to the end of the pattern. This is done to provide a
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way of testing the error condition that arises if a pattern finishes with a
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backslash, because
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<pre>
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  /abc\/
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</pre>
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is interpreted as the first line of a pattern that starts with "abc/", causing
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pcretest to read the next line as a continuation of the regular expression.
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</P>
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<br><a name="SEC4" href="#TOC1">PATTERN MODIFIERS</a><br>
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<P>
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A pattern may be followed by any number of modifiers, which are mostly single
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characters. Following Perl usage, these are referred to below as, for example,
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"the <b>/i</b> modifier", even though the delimiter of the pattern need not
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always be a slash, and no slash is used when writing modifiers. Whitespace may
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appear between the final pattern delimiter and the first modifier, and between
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the modifiers themselves.
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</P>
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<P>
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The <b>/i</b>, <b>/m</b>, <b>/s</b>, and <b>/x</b> modifiers set the PCRE_CASELESS,
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PCRE_MULTILINE, PCRE_DOTALL, or PCRE_EXTENDED options, respectively, when
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<b>pcre_compile()</b> is called. These four modifier letters have the same
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effect as they do in Perl. For example:
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<pre>
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  /caseless/i
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</pre>
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The following table shows additional modifiers for setting PCRE options that do
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not correspond to anything in Perl:
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<pre>
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  <b>/A</b>              PCRE_ANCHORED
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  <b>/C</b>              PCRE_AUTO_CALLOUT
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  <b>/E</b>              PCRE_DOLLAR_ENDONLY
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  <b>/f</b>              PCRE_FIRSTLINE
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  <b>/J</b>              PCRE_DUPNAMES
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  <b>/N</b>              PCRE_NO_AUTO_CAPTURE
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  <b>/U</b>              PCRE_UNGREEDY
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  <b>/X</b>              PCRE_EXTRA
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  <b>/&#60;JS&#62;</b>           PCRE_JAVASCRIPT_COMPAT
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  <b>/&#60;cr&#62;</b>           PCRE_NEWLINE_CR
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  <b>/&#60;lf&#62;</b>           PCRE_NEWLINE_LF
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  <b>/&#60;crlf&#62;</b>         PCRE_NEWLINE_CRLF
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  <b>/&#60;anycrlf&#62;</b>      PCRE_NEWLINE_ANYCRLF
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  <b>/&#60;any&#62;</b>          PCRE_NEWLINE_ANY
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  <b>/&#60;bsr_anycrlf&#62;</b>  PCRE_BSR_ANYCRLF
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  <b>/&#60;bsr_unicode&#62;</b>  PCRE_BSR_UNICODE
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</pre>
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Those specifying line ending sequences are literal strings as shown, but the
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letters can be in either case. This example sets multiline matching with CRLF
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as the line ending sequence:
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<pre>
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  /^abc/m&#60;crlf&#62;
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</pre>
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Details of the meanings of these PCRE options are given in the
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<a href="pcreapi.html"><b>pcreapi</b></a>
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documentation.
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</P>
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<br><b>
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Finding all matches in a string
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</b><br>
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<P>
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Searching for all possible matches within each subject string can be requested
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by the <b>/g</b> or <b>/G</b> modifier. After finding a match, PCRE is called
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again to search the remainder of the subject string. The difference between
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<b>/g</b> and <b>/G</b> is that the former uses the <i>startoffset</i> argument to
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<b>pcre_exec()</b> to start searching at a new point within the entire string
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(which is in effect what Perl does), whereas the latter passes over a shortened
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substring. This makes a difference to the matching process if the pattern
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begins with a lookbehind assertion (including \b or \B).
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</P>
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<P>
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If any call to <b>pcre_exec()</b> in a <b>/g</b> or <b>/G</b> sequence matches an
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empty string, the next call is done with the PCRE_NOTEMPTY and PCRE_ANCHORED
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flags set in order to search for another, non-empty, match at the same point.
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If this second match fails, the start offset is advanced by one, and the normal
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match is retried. This imitates the way Perl handles such cases when using the
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<b>/g</b> modifier or the <b>split()</b> function.
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</P>
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<br><b>
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Other modifiers
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</b><br>
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<P>
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There are yet more modifiers for controlling the way <b>pcretest</b>
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operates.
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</P>
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<P>
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The <b>/+</b> modifier requests that as well as outputting the substring that
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matched the entire pattern, pcretest should in addition output the remainder of
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the subject string. This is useful for tests where the subject contains
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multiple copies of the same substring.
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</P>
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<P>
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The <b>/B</b> modifier is a debugging feature. It requests that <b>pcretest</b>
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output a representation of the compiled byte code after compilation. Normally
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this information contains length and offset values; however, if <b>/Z</b> is
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also present, this data is replaced by spaces. This is a special feature for
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use in the automatic test scripts; it ensures that the same output is generated
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for different internal link sizes.
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</P>
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<P>
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The <b>/L</b> modifier must be followed directly by the name of a locale, for
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example,
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<pre>
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  /pattern/Lfr_FR
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</pre>
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For this reason, it must be the last modifier. The given locale is set,
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<b>pcre_maketables()</b> is called to build a set of character tables for the
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locale, and this is then passed to <b>pcre_compile()</b> when compiling the
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regular expression. Without an <b>/L</b> modifier, NULL is passed as the tables
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pointer; that is, <b>/L</b> applies only to the expression on which it appears.
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</P>
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<P>
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The <b>/I</b> modifier requests that <b>pcretest</b> output information about the
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compiled pattern (whether it is anchored, has a fixed first character, and
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so on). It does this by calling <b>pcre_fullinfo()</b> after compiling a
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pattern. If the pattern is studied, the results of that are also output.
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</P>
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<P>
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The <b>/D</b> modifier is a PCRE debugging feature, and is equivalent to
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<b>/BI</b>, that is, both the <b>/B</b> and the <b>/I</b> modifiers.
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</P>
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<P>
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The <b>/F</b> modifier causes <b>pcretest</b> to flip the byte order of the
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fields in the compiled pattern that contain 2-byte and 4-byte numbers. This
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facility is for testing the feature in PCRE that allows it to execute patterns
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that were compiled on a host with a different endianness. This feature is not
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available when the POSIX interface to PCRE is being used, that is, when the
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<b>/P</b> pattern modifier is specified. See also the section about saving and
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reloading compiled patterns below.
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</P>
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<P>
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The <b>/S</b> modifier causes <b>pcre_study()</b> to be called after the
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expression has been compiled, and the results used when the expression is
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matched.
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</P>
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<P>
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The <b>/M</b> modifier causes the size of memory block used to hold the compiled
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pattern to be output.
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</P>
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<P>
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The <b>/P</b> modifier causes <b>pcretest</b> to call PCRE via the POSIX wrapper
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API rather than its native API. When this is done, all other modifiers except
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<b>/i</b>, <b>/m</b>, and <b>/+</b> are ignored. REG_ICASE is set if <b>/i</b> is
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present, and REG_NEWLINE is set if <b>/m</b> is present. The wrapper functions
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force PCRE_DOLLAR_ENDONLY always, and PCRE_DOTALL unless REG_NEWLINE is set.
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</P>
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<P>
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The <b>/8</b> modifier causes <b>pcretest</b> to call PCRE with the PCRE_UTF8
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option set. This turns on support for UTF-8 character handling in PCRE,
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provided that it was compiled with this support enabled. This modifier also
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causes any non-printing characters in output strings to be printed using the
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\x{hh...} notation if they are valid UTF-8 sequences.
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</P>
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<P>
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If the <b>/?</b> modifier is used with <b>/8</b>, it causes <b>pcretest</b> to
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call <b>pcre_compile()</b> with the PCRE_NO_UTF8_CHECK option, to suppress the
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checking of the string for UTF-8 validity.
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</P>
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<br><a name="SEC5" href="#TOC1">DATA LINES</a><br>
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<P>
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Before each data line is passed to <b>pcre_exec()</b>, leading and trailing
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whitespace is removed, and it is then scanned for \ escapes. Some of these are
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pretty esoteric features, intended for checking out some of the more
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complicated features of PCRE. If you are just testing "ordinary" regular
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expressions, you probably don't need any of these. The following escapes are
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recognized:
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<pre>
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  \a         alarm (BEL, \x07)
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  \b         backspace (\x08)
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  \e         escape (\x27)
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  \f         formfeed (\x0c)
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  \n         newline (\x0a)
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  \qdd       set the PCRE_MATCH_LIMIT limit to dd (any number of digits)
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  \r         carriage return (\x0d)
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  \t         tab (\x09)
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  \v         vertical tab (\x0b)
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  \nnn       octal character (up to 3 octal digits)
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  \xhh       hexadecimal character (up to 2 hex digits)
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  \x{hh...}  hexadecimal character, any number of digits in UTF-8 mode
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  \A         pass the PCRE_ANCHORED option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
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  \B         pass the PCRE_NOTBOL option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
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  \Cdd       call pcre_copy_substring() for substring dd after a successful match (number less than 32)
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  \Cname     call pcre_copy_named_substring() for substring "name" after a successful match (name termin-
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               ated by next non alphanumeric character)
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  \C+        show the current captured substrings at callout time
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  \C-        do not supply a callout function
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  \C!n       return 1 instead of 0 when callout number n is reached
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  \C!n!m     return 1 instead of 0 when callout number n is reached for the nth time
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  \C*n       pass the number n (may be negative) as callout data; this is used as the callout return value
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  \D         use the <b>pcre_dfa_exec()</b> match function
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  \F         only shortest match for <b>pcre_dfa_exec()</b>
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  \Gdd       call pcre_get_substring() for substring dd after a successful match (number less than 32)
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  \Gname     call pcre_get_named_substring() for substring "name" after a successful match (name termin-
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               ated by next non-alphanumeric character)
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  \L         call pcre_get_substringlist() after a successful match
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  \M         discover the minimum MATCH_LIMIT and MATCH_LIMIT_RECURSION settings
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   367
 
  \N         pass the PCRE_NOTEMPTY option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   368
 
  \Odd       set the size of the output vector passed to <b>pcre_exec()</b> to dd (any number of digits)
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   369
 
  \P         pass the PCRE_PARTIAL option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   370
 
  \Qdd       set the PCRE_MATCH_LIMIT_RECURSION limit to dd (any number of digits)
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   371
 
  \R         pass the PCRE_DFA_RESTART option to <b>pcre_dfa_exec()</b>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   372
 
  \S         output details of memory get/free calls during matching
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   373
 
  \Z         pass the PCRE_NOTEOL option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   374
 
  \?         pass the PCRE_NO_UTF8_CHECK option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   375
 
  \&#62;dd       start the match at offset dd (any number of digits);
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   376
 
               this sets the <i>startoffset</i> argument for <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   377
 
  \&#60;cr&#62;      pass the PCRE_NEWLINE_CR option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   378
 
  \&#60;lf&#62;      pass the PCRE_NEWLINE_LF option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   379
 
  \&#60;crlf&#62;    pass the PCRE_NEWLINE_CRLF option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   380
 
  \&#60;anycrlf&#62; pass the PCRE_NEWLINE_ANYCRLF option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   381
 
  \&#60;any&#62;     pass the PCRE_NEWLINE_ANY option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   382
 
</pre>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   383
 
The escapes that specify line ending sequences are literal strings, exactly as
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   384
 
shown. No more than one newline setting should be present in any data line.
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   385
 
</P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   386
 
<P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   387
 
A backslash followed by anything else just escapes the anything else. If
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   388
 
the very last character is a backslash, it is ignored. This gives a way of
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   389
 
passing an empty line as data, since a real empty line terminates the data
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   390
 
input.
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   391
 
</P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   392
 
<P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   393
 
If \M is present, <b>pcretest</b> calls <b>pcre_exec()</b> several times, with
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   394
 
different values in the <i>match_limit</i> and <i>match_limit_recursion</i>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   395
 
fields of the <b>pcre_extra</b> data structure, until it finds the minimum
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   396
 
numbers for each parameter that allow <b>pcre_exec()</b> to complete. The
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   397
 
<i>match_limit</i> number is a measure of the amount of backtracking that takes
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   398
 
place, and checking it out can be instructive. For most simple matches, the
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   399
 
number is quite small, but for patterns with very large numbers of matching
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   400
 
possibilities, it can become large very quickly with increasing length of
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   401
 
subject string. The <i>match_limit_recursion</i> number is a measure of how much
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   402
 
stack (or, if PCRE is compiled with NO_RECURSE, how much heap) memory is needed
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   403
 
to complete the match attempt.
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   404
 
</P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   405
 
<P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   406
 
When \O is used, the value specified may be higher or lower than the size set
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   407
 
by the <b>-O</b> command line option (or defaulted to 45); \O applies only to
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   408
 
the call of <b>pcre_exec()</b> for the line in which it appears.
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   409
 
</P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   410
 
<P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   411
 
If the <b>/P</b> modifier was present on the pattern, causing the POSIX wrapper
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   412
 
API to be used, the only option-setting sequences that have any effect are \B
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   413
 
and \Z, causing REG_NOTBOL and REG_NOTEOL, respectively, to be passed to
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   414
 
<b>regexec()</b>.
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   415
 
</P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   416
 
<P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   417
 
The use of \x{hh...} to represent UTF-8 characters is not dependent on the use
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   418
 
of the <b>/8</b> modifier on the pattern. It is recognized always. There may be
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   419
 
any number of hexadecimal digits inside the braces. The result is from one to
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   420
 
six bytes, encoded according to the original UTF-8 rules of RFC 2279. This
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   421
 
allows for values in the range 0 to 0x7FFFFFFF. Note that not all of those are
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   422
 
valid Unicode code points, or indeed valid UTF-8 characters according to the
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   423
 
later rules in RFC 3629.
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   424
 
</P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   425
 
<br><a name="SEC6" href="#TOC1">THE ALTERNATIVE MATCHING FUNCTION</a><br>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   426
 
<P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   427
 
By default, <b>pcretest</b> uses the standard PCRE matching function,
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   428
 
<b>pcre_exec()</b> to match each data line. From release 6.0, PCRE supports an
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   429
 
alternative matching function, <b>pcre_dfa_test()</b>, which operates in a
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   430
 
different way, and has some restrictions. The differences between the two
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   431
 
functions are described in the
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   432
 
<a href="pcrematching.html"><b>pcrematching</b></a>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   433
 
documentation.
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   434
 
</P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   435
 
<P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   436
 
If a data line contains the \D escape sequence, or if the command line
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   437
 
contains the <b>-dfa</b> option, the alternative matching function is called.
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   438
 
This function finds all possible matches at a given point. If, however, the \F
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   439
 
escape sequence is present in the data line, it stops after the first match is
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   440
 
found. This is always the shortest possible match.
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   441
 
</P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   442
 
<br><a name="SEC7" href="#TOC1">DEFAULT OUTPUT FROM PCRETEST</a><br>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   443
 
<P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   444
 
This section describes the output when the normal matching function,
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   445
 
<b>pcre_exec()</b>, is being used.
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   446
 
</P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   447
 
<P>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   448
 
When a match succeeds, pcretest outputs the list of captured substrings that
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   449
 
<b>pcre_exec()</b> returns, starting with number 0 for the string that matched
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   450
 
the whole pattern. Otherwise, it outputs "No match" or "Partial match"
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   451
 
when <b>pcre_exec()</b> returns PCRE_ERROR_NOMATCH or PCRE_ERROR_PARTIAL,
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   452
 
respectively, and otherwise the PCRE negative error number. Here is an example
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   453
 
of an interactive <b>pcretest</b> run.
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   454
 
<pre>
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   455
 
  $ pcretest
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   456
 
  PCRE version 7.0 30-Nov-2006
7f656887cf89 First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
diff changeset 
   457
 












7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   458


    re&#62; /^abc(\d+)/













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   459


  data&#62; abc123













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   460


   0: abc123













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   461


   1: 123













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   462


  data&#62; xyz













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   463


  No match













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   464


</pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   465


Note that unset capturing substrings that are not followed by one that is set













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   466


are not returned by <b>pcre_exec()</b>, and are not shown by <b>pcretest</b>. In













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   467


the following example, there are two capturing substrings, but when the first













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   468


data line is matched, the second, unset substring is not shown. An "internal"













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   469


unset substring is shown as "&#60;unset&#62;", as for the second data line.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   470


<pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   471


    re&#62; /(a)|(b)/













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   472


  data&#62; a













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   473


   0: a













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   474


   1: a













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   475


  data&#62; b













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   476


   0: b













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   477


   1: &#60;unset&#62;













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   478


   2: b













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   479


</pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   480


If the strings contain any non-printing characters, they are output as \0x













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   481


escapes, or as \x{...} escapes if the <b>/8</b> modifier was present on the













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   482


pattern. See below for the definition of non-printing characters. If the













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   483


pattern has the <b>/+</b> modifier, the output for substring 0 is followed by













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   484


the the rest of the subject string, identified by "0+" like this:













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   485


<pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   486


    re&#62; /cat/+













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   487


  data&#62; cataract













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   488


   0: cat













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   489


   0+ aract













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   490


</pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   491


If the pattern has the <b>/g</b> or <b>/G</b> modifier, the results of successive













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   492


matching attempts are output in sequence, like this:













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   493


<pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   494


    re&#62; /\Bi(\w\w)/g













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   495


  data&#62; Mississippi













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   496


   0: iss













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   497


   1: ss













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   498


   0: iss













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   499


   1: ss













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   500


   0: ipp













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   501


   1: pp













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   502


</pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   503


"No match" is output only if the first match attempt fails.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   504


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   505


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   506


If any of the sequences <b>\C</b>, <b>\G</b>, or <b>\L</b> are present in a













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   507


data line that is successfully matched, the substrings extracted by the













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   508


convenience functions are output with C, G, or L after the string number













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   509


instead of a colon. This is in addition to the normal full list. The string













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   510


length (that is, the return from the extraction function) is given in













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   511


parentheses after each string for <b>\C</b> and <b>\G</b>.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   512


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   513


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   514


Note that whereas patterns can be continued over several lines (a plain "&#62;"













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   515


prompt is used for continuations), data lines may not. However newlines can be













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   516


included in data by means of the \n escape (or \r, \r\n, etc., depending on













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   517


the newline sequence setting).













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   518


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   519


<br><a name="SEC8" href="#TOC1">OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION</a><br>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   520


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   521


When the alternative matching function, <b>pcre_dfa_exec()</b>, is used (by













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   522


means of the \D escape sequence or the <b>-dfa</b> command line option), the













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   523


output consists of a list of all the matches that start at the first point in













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   524


the subject where there is at least one match. For example:













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   525


<pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   526


    re&#62; /(tang|tangerine|tan)/













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   527


  data&#62; yellow tangerine\D













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   528


   0: tangerine













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   529


   1: tang













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   530


   2: tan













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   531


</pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   532


(Using the normal matching function on this data finds only "tang".) The













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   533


longest matching string is always given first (and numbered zero).













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   534


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   535


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   536


If <b>/g</b> is present on the pattern, the search for further matches resumes













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   537


at the end of the longest match. For example:













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   538


<pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   539


    re&#62; /(tang|tangerine|tan)/g













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   540


  data&#62; yellow tangerine and tangy sultana\D













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   541


   0: tangerine













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   542


   1: tang













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   543


   2: tan













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   544


   0: tang













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   545


   1: tan













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   546


   0: tan













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   547


</pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   548


Since the matching function does not support substring capture, the escape













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   549


sequences that are concerned with captured substrings are not relevant.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   550


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   551


<br><a name="SEC9" href="#TOC1">RESTARTING AFTER A PARTIAL MATCH</a><br>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   552


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   553


When the alternative matching function has given the PCRE_ERROR_PARTIAL return,













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   554


indicating that the subject partially matched the pattern, you can restart the













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   555


match with additional subject data by means of the \R escape sequence. For













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   556


example:













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   557


<pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   558


    re&#62; /^\d?\d(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)\d\d$/













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   559


  data&#62; 23ja\P\D













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   560


  Partial match: 23ja













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   561


  data&#62; n05\R\D













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   562


   0: n05













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   563


</pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   564


For further information about partial matching, see the













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   565


<a href="pcrepartial.html"><b>pcrepartial</b></a>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   566


documentation.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   567


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   568


<br><a name="SEC10" href="#TOC1">CALLOUTS</a><br>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   569


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   570


If the pattern contains any callout requests, <b>pcretest</b>'s callout function













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   571


is called during matching. This works with both matching functions. By default,













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   572


the called function displays the callout number, the start and current













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   573


positions in the text at the callout time, and the next pattern item to be













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   574


tested. For example, the output













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   575


<pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   576


  ---&#62;pqrabcdef













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   577


    0    ^  ^     \d













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   578


</pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   579


indicates that callout number 0 occurred for a match attempt starting at the













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   580


fourth character of the subject string, when the pointer was at the seventh













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   581


character of the data, and when the next pattern item was \d. Just one













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   582


circumflex is output if the start and current positions are the same.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   583


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   584


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   585


Callouts numbered 255 are assumed to be automatic callouts, inserted as a













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   586


result of the <b>/C</b> pattern modifier. In this case, instead of showing the













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   587


callout number, the offset in the pattern, preceded by a plus, is output. For













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   588


example:













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   589


<pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   590


    re&#62; /\d?[A-E]\*/C













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   591


  data&#62; E*













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   592


  ---&#62;E*













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   593


   +0 ^      \d?













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   594


   +3 ^      [A-E]













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   595


   +8 ^^     \*













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   596


  +10 ^ ^













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   597


   0: E*













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   598


</pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   599


The callout function in <b>pcretest</b> returns zero (carry on matching) by













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   600


default, but you can use a \C item in a data line (as described above) to













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   601


change this.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   602


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   603


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   604


Inserting callouts can be helpful when using <b>pcretest</b> to check













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   605


complicated regular expressions. For further information about callouts, see













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   606


the













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   607


<a href="pcrecallout.html"><b>pcrecallout</b></a>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   608


documentation.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   609


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   610


<br><a name="SEC11" href="#TOC1">NON-PRINTING CHARACTERS</a><br>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   611


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   612


When <b>pcretest</b> is outputting text in the compiled version of a pattern,













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   613


bytes other than 32-126 are always treated as non-printing characters are are













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   614


therefore shown as hex escapes.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   615


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   616


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   617


When <b>pcretest</b> is outputting text that is a matched part of a subject













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   618


string, it behaves in the same way, unless a different locale has been set for













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   619


the pattern (using the <b>/L</b> modifier). In this case, the <b>isprint()</b>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   620


function to distinguish printing and non-printing characters.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   621


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   622


<br><a name="SEC12" href="#TOC1">SAVING AND RELOADING COMPILED PATTERNS</a><br>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   623


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   624


The facilities described in this section are not available when the POSIX













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   625


inteface to PCRE is being used, that is, when the <b>/P</b> pattern modifier is













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   626


specified.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   627


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   628


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   629


When the POSIX interface is not in use, you can cause <b>pcretest</b> to write a













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   630


compiled pattern to a file, by following the modifiers with &#62; and a file name.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   631


For example:













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   632


<pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   633


  /pattern/im &#62;/some/file













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   634


</pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   635


See the













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   636


<a href="pcreprecompile.html"><b>pcreprecompile</b></a>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   637


documentation for a discussion about saving and re-using compiled patterns.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   638


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   639


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   640


The data that is written is binary. The first eight bytes are the length of the













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   641


compiled pattern data followed by the length of the optional study data, each













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   642


written as four bytes in big-endian order (most significant byte first). If













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   643


there is no study data (either the pattern was not studied, or studying did not













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   644


return any data), the second length is zero. The lengths are followed by an













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   645


exact copy of the compiled pattern. If there is additional study data, this













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   646


follows immediately after the compiled pattern. After writing the file,













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   647


<b>pcretest</b> expects to read a new pattern.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   648


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   649


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   650


A saved pattern can be reloaded into <b>pcretest</b> by specifing &#60; and a file













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   651


name instead of a pattern. The name of the file must not contain a &#60; character,













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   652


as otherwise <b>pcretest</b> will interpret the line as a pattern delimited by &#60;













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   653


characters.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   654


For example:













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   655


<pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   656


   re&#62; &#60;/some/file













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   657


  Compiled regex loaded from /some/file













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   658


  No study data













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   659


</pre>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   660


When the pattern has been loaded, <b>pcretest</b> proceeds to read data lines in













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   661


the usual way.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   662


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   663


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   664


You can copy a file written by <b>pcretest</b> to a different host and reload it













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   665


there, even if the new host has opposite endianness to the one on which the













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   666


pattern was compiled. For example, you can compile on an i86 machine and run on













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   667


a SPARC machine.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   668


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   669


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   670


File names for saving and reloading can be absolute or relative, but note that













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   671


the shell facility of expanding a file name that starts with a tilde (~) is not













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   672


available.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   673


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   674


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   675


The ability to save and reload files in <b>pcretest</b> is intended for testing













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   676


and experimentation. It is not intended for production use because only a













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   677


single pattern can be written to a file. Furthermore, there is no facility for













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   678


supplying custom character tables for use with a reloaded pattern. If the













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   679


original pattern was compiled with custom tables, an attempt to match a subject













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   680


string using a reloaded pattern is likely to cause <b>pcretest</b> to crash.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   681


Finally, if you attempt to load a file that is not in the correct format, the













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   682


result is undefined.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   683


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   684


<br><a name="SEC13" href="#TOC1">SEE ALSO</a><br>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   685


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   686


<b>pcre</b>(3), <b>pcreapi</b>(3), <b>pcrecallout</b>(3), <b>pcrematching</b>(3),













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   687


<b>pcrepartial</b>(d), <b>pcrepattern</b>(3), <b>pcreprecompile</b>(3).













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   688


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   689


<br><a name="SEC14" href="#TOC1">AUTHOR</a><br>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   690


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   691


Philip Hazel













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   692


<br>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   693


University Computing Service













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   694


<br>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   695


Cambridge CB2 3QH, England.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   696


<br>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   697


</P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   698


<br><a name="SEC15" href="#TOC1">REVISION</a><br>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   699


<P>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   700


Last updated: 12 April 2008













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   701


<br>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   702


Copyright &copy; 1997-2008 University of Cambridge.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   703


<br>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   704


<p>













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   705


Return to the <a href="index.html">PCRE index page</a>.













7f656887cf89
First submission to Symbian Foundation staging server.



Tom Sutcliffe <thomas.sutcliffe@accenture.com>


parents: 

diff
changeset




   706


</p>















FCL/sf/os/fshell