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libraries/spcre/libpcre/pcre/doc/html/pcresample.html
author Tom Sutcliffe <thomas.sutcliffe@accenture.com>
Sat, 31 Jul 2010 19:07:57 +0100
changeset 23 092bcc217d9d
parent 0 7f656887cf89
permissions -rw-r--r--
Tidied iocli exports, build macro tweaks. Removed 4 overloads of CCommandBase::RunCommand[L] that are no longer used at all, and changed one more to not be exported as it's only used internally to iocli.dll. fixed builds on platforms that don't support btrace or any form of tracing.
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<html>
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<head>
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<title>pcresample 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>pcresample 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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<br><b>
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PCRE SAMPLE PROGRAM
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</b><br>
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<P>
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A simple, complete demonstration program, to get you started with using PCRE,
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is supplied in the file <i>pcredemo.c</i> in the PCRE distribution.
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</P>
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<P>
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The program compiles the regular expression that is its first argument, and
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matches it against the subject string in its second argument. No PCRE options
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are set, and default character tables are used. If matching succeeds, the
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program outputs the portion of the subject that matched, together with the
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contents of any captured substrings.
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</P>
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<P>
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If the -g option is given on the command line, the program then goes on to
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check for further matches of the same regular expression in the same subject
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string. The logic is a little bit tricky because of the possibility of matching
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an empty string. Comments in the code explain what is going on.
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</P>
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<P>
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If PCRE is installed in the standard include and library directories for your
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system, you should be able to compile the demonstration program using this
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command:
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<pre>
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  gcc -o pcredemo pcredemo.c -lpcre
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</pre>
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If PCRE is installed elsewhere, you may need to add additional options to the
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command line. For example, on a Unix-like system that has PCRE installed in
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<i>/usr/local</i>, you can compile the demonstration program using a command
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like this:
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<pre>
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  gcc -o pcredemo -I/usr/local/include pcredemo.c -L/usr/local/lib -lpcre
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</pre>
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Once you have compiled the demonstration program, you can run simple tests like
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this:
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<pre>
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  ./pcredemo 'cat|dog' 'the cat sat on the mat'
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  ./pcredemo -g 'cat|dog' 'the dog sat on the cat'
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</pre>
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Note that there is a much more comprehensive test program, called
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<a href="pcretest.html"><b>pcretest</b>,</a>
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which supports many more facilities for testing regular expressions and the
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PCRE library. The <b>pcredemo</b> program is provided as a simple coding
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example.
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</P>
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<P>
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On some operating systems (e.g. Solaris), when PCRE is not installed in the
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standard library directory, you may get an error like this when you try to run
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<b>pcredemo</b>:
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<pre>
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  ld.so.1: a.out: fatal: libpcre.so.0: open failed: No such file or directory
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</pre>
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This is caused by the way shared library support works on those systems. You
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need to add
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<pre>
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  -R/usr/local/lib
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</pre>
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(for example) to the compile command to get round this problem.
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</P>
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<br><b>
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AUTHOR
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</b><br>
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<P>
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Philip Hazel
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<br>
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University Computing Service
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<br>
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Cambridge CB2 3QH, England.
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<br>
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</P>
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<br><b>
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REVISION
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</b><br>
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<P>
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Last updated: 23 January 2008
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<br>
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Copyright &copy; 1997-2008 University of Cambridge.
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<br>
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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>
FCL/sf/os/fshell