135 lines
4.2 KiB
HTML
135 lines
4.2 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of PCRESAMPLE</TITLE>
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</HEAD><BODY>
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<H1>PCRESAMPLE</H1>
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Section: C Library Functions (3)<BR>Updated: 10 January 2012<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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PCRE - Perl-compatible regular expressions
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<A NAME="lbAC"> </A>
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<H2>PCRE SAMPLE PROGRAM</H2>
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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. A listing of
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this program is given in the
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<B>pcredemo</B>
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documentation. If you do not have a copy of the PCRE distribution, you can save
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this listing to re-create <I>pcredemo.c</I>.
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<P>
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The demonstration program, which uses the original PCRE 8-bit library, compiles
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the regular expression that is its first argument, and matches it against the
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subject string in its second argument. No PCRE options are set, and default
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character tables are used. If matching succeeds, the program outputs the
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portion of the subject that matched, together with the contents of any captured
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substrings.
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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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If PCRE is installed in the standard include and library directories for your
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operating system, you should be able to compile the demonstration program using
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this command:
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<P>
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<BR> gcc -o pcredemo pcredemo.c -lpcre
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<P>
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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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<P>
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<BR> gcc -o pcredemo -I/usr/local/include pcredemo.c \
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<BR> -L/usr/local/lib -lpcre
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<P>
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In a Windows environment, if you want to statically link the program against a
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non-dll <B>pcre.a</B> file, you must uncomment the line that defines PCRE_STATIC
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before including <B>pcre.h</B>, because otherwise the <B>pcre_malloc()</B> and
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<B>pcre_free()</B> exported functions will be declared
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<B>__declspec(dllimport)</B>, with unwanted results.
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<P>
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Once you have compiled and linked the demonstration program, you can run simple
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tests like this:
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<P>
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<BR> ./pcredemo 'cat|dog' 'the cat sat on the mat'
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<BR> ./pcredemo -g 'cat|dog' 'the dog sat on the cat'
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<P>
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Note that there is a much more comprehensive test program, called
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<B>pcretest</B>,
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which supports many more facilities for testing regular expressions and both
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PCRE libraries. The
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<B>pcredemo</B>
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program is provided as a simple coding example.
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<P>
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If you try to run
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<B>pcredemo</B>
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when PCRE is not installed in the standard library directory, you may get an
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error like this on some operating systems (e.g. Solaris):
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<P>
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<BR> ld.so.1: a.out: fatal: libpcre.so.0: open failed: No such file or directory
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<P>
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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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<P>
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<BR> -R/usr/local/lib
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<P>
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(for example) to the compile command to get round this problem.
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<A NAME="lbAD"> </A>
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<H2>AUTHOR</H2>
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<P>
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<PRE>
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Philip Hazel
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University Computing Service
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Cambridge CB2 3QH, England.
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</PRE>
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<A NAME="lbAE"> </A>
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<H2>REVISION</H2>
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<P>
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<PRE>
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Last updated: 10 January 2012
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Copyright (c) 1997-2012 University of Cambridge.
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</PRE>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="1"><A HREF="#lbAB">NAME</A><DD>
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<DT id="2"><A HREF="#lbAC">PCRE SAMPLE PROGRAM</A><DD>
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<DT id="3"><A HREF="#lbAD">AUTHOR</A><DD>
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<DT id="4"><A HREF="#lbAE">REVISION</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:52 GMT, March 31, 2021
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