107 lines
3.4 KiB
HTML
107 lines
3.4 KiB
HTML
<html>
|
|
<head>
|
|
<title>pcre2sample specification</title>
|
|
</head>
|
|
<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
|
|
<h1>pcre2sample man page</h1>
|
|
<p>
|
|
Return to the <a href="index.html">PCRE2 index page</a>.
|
|
</p>
|
|
<p>
|
|
This page is part of the PCRE2 HTML documentation. It was generated
|
|
automatically from the original man page. If there is any nonsense in it,
|
|
please consult the man page, in case the conversion went wrong.
|
|
<br>
|
|
<br><b>
|
|
PCRE2 SAMPLE PROGRAM
|
|
</b><br>
|
|
<P>
|
|
A simple, complete demonstration program to get you started with using PCRE2 is
|
|
supplied in the file <i>pcre2demo.c</i> in the <b>src</b> directory in the PCRE2
|
|
distribution. A listing of this program is given in the
|
|
<a href="pcre2demo.html"><b>pcre2demo</b></a>
|
|
documentation. If you do not have a copy of the PCRE2 distribution, you can
|
|
save this listing to re-create the contents of <i>pcre2demo.c</i>.
|
|
</P>
|
|
<P>
|
|
The demonstration program, which uses the PCRE2 8-bit library, compiles the
|
|
regular expression that is its first argument, and matches it against the
|
|
subject string in its second argument. No PCRE2 options are set, and default
|
|
character tables are used. If matching succeeds, the program outputs the
|
|
portion of the subject that matched, together with the contents of any captured
|
|
substrings.
|
|
</P>
|
|
<P>
|
|
If the -g option is given on the command line, the program then goes on to
|
|
check for further matches of the same regular expression in the same subject
|
|
string. The logic is a little bit tricky because of the possibility of matching
|
|
an empty string. Comments in the code explain what is going on.
|
|
</P>
|
|
<P>
|
|
If PCRE2 is installed in the standard include and library directories for your
|
|
operating system, you should be able to compile the demonstration program using
|
|
this command:
|
|
<pre>
|
|
gcc -o pcre2demo pcre2demo.c -lpcre2-8
|
|
</pre>
|
|
If PCRE2 is installed elsewhere, you may need to add additional options to the
|
|
command line. For example, on a Unix-like system that has PCRE2 installed in
|
|
<i>/usr/local</i>, you can compile the demonstration program using a command
|
|
like this:
|
|
<pre>
|
|
gcc -o pcre2demo -I/usr/local/include pcre2demo.c -L/usr/local/lib -lpcre2-8
|
|
|
|
</PRE>
|
|
</P>
|
|
<P>
|
|
Once you have compiled and linked the demonstration program, you can run simple
|
|
tests like this:
|
|
<pre>
|
|
./pcre2demo 'cat|dog' 'the cat sat on the mat'
|
|
./pcre2demo -g 'cat|dog' 'the dog sat on the cat'
|
|
</pre>
|
|
Note that there is a much more comprehensive test program, called
|
|
<a href="pcre2test.html"><b>pcre2test</b>,</a>
|
|
which supports many more facilities for testing regular expressions using the
|
|
PCRE2 libraries. The
|
|
<a href="pcre2demo.html"><b>pcre2demo</b></a>
|
|
program is provided as a simple coding example.
|
|
</P>
|
|
<P>
|
|
If you try to run
|
|
<a href="pcre2demo.html"><b>pcre2demo</b></a>
|
|
when PCRE2 is not installed in the standard library directory, you may get an
|
|
error like this on some operating systems (e.g. Solaris):
|
|
<pre>
|
|
ld.so.1: a.out: fatal: libpcre2.so.0: open failed: No such file or directory
|
|
</pre>
|
|
This is caused by the way shared library support works on those systems. You
|
|
need to add
|
|
<pre>
|
|
-R/usr/local/lib
|
|
</pre>
|
|
(for example) to the compile command to get round this problem.
|
|
</P>
|
|
<br><b>
|
|
AUTHOR
|
|
</b><br>
|
|
<P>
|
|
Philip Hazel
|
|
<br>
|
|
University Computing Service
|
|
<br>
|
|
Cambridge, England.
|
|
<br>
|
|
</P>
|
|
<br><b>
|
|
REVISION
|
|
</b><br>
|
|
<P>
|
|
Last updated: 20 October 2014
|
|
<br>
|
|
Copyright © 1997-2014 University of Cambridge.
|
|
<br>
|
|
<p>
|
|
Return to the <a href="index.html">PCRE2 index page</a>.
|
|
</p>
|