| 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-- |
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First submission to Symbian Foundation staging server.
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parents:
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<html> |
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parents:
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<head> |
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<title>pcreprecompile specification</title> |
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</head> |
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parents:
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<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB"> |
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7f656887cf89
First submission to Symbian Foundation staging server.
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parents:
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<h1>pcreprecompile man page</h1> |
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parents:
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<p> |
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First submission to Symbian Foundation staging server.
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parents:
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Return to the <a href="index.html">PCRE index page</a>. |
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parents:
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</p> |
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parents:
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<p> |
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First submission to Symbian Foundation staging server.
Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
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This page is part of the PCRE HTML documentation. It was generated automatically |
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parents:
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from the original man page. If there is any nonsense in it, please consult the |
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parents:
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man page, in case the conversion went wrong. |
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First submission to Symbian Foundation staging server.
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parents:
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<br> |
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parents:
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<ul> |
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First submission to Symbian Foundation staging server.
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parents:
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<li><a name="TOC1" href="#SEC1">SAVING AND RE-USING PRECOMPILED PCRE PATTERNS</a> |
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<li><a name="TOC2" href="#SEC2">SAVING A COMPILED PATTERN</a> |
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<li><a name="TOC3" href="#SEC3">RE-USING A PRECOMPILED PATTERN</a> |
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<li><a name="TOC4" href="#SEC4">COMPATIBILITY WITH DIFFERENT PCRE RELEASES</a> |
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<li><a name="TOC5" href="#SEC5">AUTHOR</a> |
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<li><a name="TOC6" href="#SEC6">REVISION</a> |
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</ul> |
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parents:
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<br><a name="SEC1" href="#TOC1">SAVING AND RE-USING PRECOMPILED PCRE PATTERNS</a><br> |
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parents:
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<P> |
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7f656887cf89
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parents:
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If you are running an application that uses a large number of regular |
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parents:
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expression patterns, it may be useful to store them in a precompiled form |
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parents:
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instead of having to compile them every time the application is run. |
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parents:
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If you are not using any private character tables (see the |
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First submission to Symbian Foundation staging server.
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parents:
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<a href="pcre_maketables.html"><b>pcre_maketables()</b></a> |
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documentation), this is relatively straightforward. If you are using private |
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parents:
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tables, it is a little bit more complicated. |
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parents:
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</P> |
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7f656887cf89
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parents:
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<P> |
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parents:
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If you save compiled patterns to a file, you can copy them to a different host |
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and run them there. This works even if the new host has the opposite endianness |
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to the one on which the patterns were compiled. There may be a small |
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First submission to Symbian Foundation staging server.
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parents:
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performance penalty, but it should be insignificant. However, compiling regular |
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expressions with one version of PCRE for use with a different version is not |
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guaranteed to work and may cause crashes. |
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</P> |
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parents:
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<br><a name="SEC2" href="#TOC1">SAVING A COMPILED PATTERN</a><br> |
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<P> |
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7f656887cf89
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The value returned by <b>pcre_compile()</b> points to a single block of memory |
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that holds the compiled pattern and associated data. You can find the length of |
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First submission to Symbian Foundation staging server.
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this block in bytes by calling <b>pcre_fullinfo()</b> with an argument of |
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PCRE_INFO_SIZE. You can then save the data in any appropriate manner. Here is |
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sample code that compiles a pattern and writes it to a file. It assumes that |
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the variable <i>fd</i> refers to a file that is open for output: |
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<pre> |
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int erroroffset, rc, size; |
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char *error; |
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pcre *re; |
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re = pcre_compile("my pattern", 0, &error, &erroroffset, NULL);
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if (re == NULL) { ... handle errors ... }
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rc = pcre_fullinfo(re, NULL, PCRE_INFO_SIZE, &size); |
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if (rc < 0) { ... handle errors ... }
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rc = fwrite(re, 1, size, fd); |
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if (rc != size) { ... handle errors ... }
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</pre> |
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In this example, the bytes that comprise the compiled pattern are copied |
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exactly. Note that this is binary data that may contain any of the 256 possible |
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byte values. On systems that make a distinction between binary and non-binary |
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data, be sure that the file is opened for binary output. |
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</P> |
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<P> |
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parents:
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67 |
If you want to write more than one pattern to a file, you will have to devise a |
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way of separating them. For binary data, preceding each pattern with its length |
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is probably the most straightforward approach. Another possibility is to write |
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out the data in hexadecimal instead of binary, one pattern to a line. |
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</P> |
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parents:
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<P> |
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Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
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Saving compiled patterns in a file is only one possible way of storing them for |
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parents:
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later use. They could equally well be saved in a database, or in the memory of |
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parents:
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some daemon process that passes them via sockets to the processes that want |
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them. |
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</P> |
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Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
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<P> |
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Tom Sutcliffe <thomas.sutcliffe@accenture.com>
parents:
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If the pattern has been studied, it is also possible to save the study data in |
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parents:
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a similar way to the compiled pattern itself. When studying generates |
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parents:
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additional information, <b>pcre_study()</b> returns a pointer to a |
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parents:
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<b>pcre_extra</b> data block. Its format is defined in the |
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<a href="pcreapi.html#extradata">section on matching a pattern</a> |
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in the |
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<a href="pcreapi.html"><b>pcreapi</b></a> |
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documentation. The <i>study_data</i> field points to the binary study data, and |
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this is what you must save (not the <b>pcre_extra</b> block itself). The length |
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of the study data can be obtained by calling <b>pcre_fullinfo()</b> with an |
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argument of PCRE_INFO_STUDYSIZE. Remember to check that <b>pcre_study()</b> did |
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return a non-NULL value before trying to save the study data. |
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</P> |
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<br><a name="SEC3" href="#TOC1">RE-USING A PRECOMPILED PATTERN</a><br> |
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parents:
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<P> |
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parents:
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94 |
Re-using a precompiled pattern is straightforward. Having reloaded it into main |
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First submission to Symbian Foundation staging server.
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parents:
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memory, you pass its pointer to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b> in |
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the usual way. This should work even on another host, and even if that host has |
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the opposite endianness to the one where the pattern was compiled. |
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</P> |
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<P> |
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However, if you passed a pointer to custom character tables when the pattern |
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was compiled (the <i>tableptr</i> argument of <b>pcre_compile()</b>), you must |
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102 |
now pass a similar pointer to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>, |
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103 |
because the value saved with the compiled pattern will obviously be nonsense. A |
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field in a <b>pcre_extra()</b> block is used to pass this data, as described in |
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the |
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<a href="pcreapi.html#extradata">section on matching a pattern</a> |
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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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<P> |
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If you did not provide custom character tables when the pattern was compiled, |
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the pointer in the compiled pattern is NULL, which causes <b>pcre_exec()</b> to |
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use PCRE's internal tables. Thus, you do not need to take any special action at |
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run time in this case. |
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</P> |
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117 |
<P> |
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If you saved study data with the compiled pattern, you need to create your own |
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<b>pcre_extra</b> data block and set the <i>study_data</i> field to point to the |
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reloaded study data. You must also set the PCRE_EXTRA_STUDY_DATA bit in the |
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<i>flags</i> field to indicate that study data is present. Then pass the |
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<b>pcre_extra</b> block to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b> in the |
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usual way. |
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</P> |
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<br><a name="SEC4" href="#TOC1">COMPATIBILITY WITH DIFFERENT PCRE RELEASES</a><br> |
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<P> |
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In general, it is safest to recompile all saved patterns when you update to a |
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new PCRE release, though not all updates actually require this. Recompiling is |
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definitely needed for release 7.2. |
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</P> |
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<br><a name="SEC5" href="#TOC1">AUTHOR</a><br> |
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<P> |
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133 |
Philip Hazel |
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<br> |
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University Computing Service |
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136 |
<br> |
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Cambridge CB2 3QH, England. |
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138 |
<br> |
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139 |
</P> |
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<br><a name="SEC6" href="#TOC1">REVISION</a><br> |
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<P> |
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142 |
Last updated: 13 June 2007 |
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143 |
<br> |
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Copyright © 1997-2007 University of Cambridge. |
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<br> |
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<p> |
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147 |
Return to the <a href="index.html">PCRE index page</a>. |
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</p> |