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+.TH PCRE 3
+.SH NAME
+PCRE - Perl-compatible regular expressions
+.SH PCRE SAMPLE PROGRAM
+.rs
+.sp
+A simple, complete demonstration program, to get you started with using PCRE,
+is supplied in the file \fIpcredemo.c\fR in the PCRE distribution.
+
+The program compiles the regular expression that is its first argument, and
+matches it against the subject string in its second argument. No PCRE 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.
+
+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.
+
+On a Unix system that has PCRE installed in \fI/usr/local\fR, you can compile
+the demonstration program using a command like this:
+
+  gcc -o pcredemo pcredemo.c -I/usr/local/include \\
+      -L/usr/local/lib -lpcre
+
+Then you can run simple tests like this:
+
+  ./pcredemo 'cat|dog' 'the cat sat on the mat'
+  ./pcredemo -g 'cat|dog' 'the dog sat on the cat'
+
+Note that there is a much more comprehensive test program, called
+\fBpcretest\fR, which supports many more facilities for testing regular
+expressions and the PCRE library. The \fBpcredemo\fR program is provided as a
+simple coding example.
+
+On some operating systems (e.g. Solaris) you may get an error like this when
+you try to run \fBpcredemo\fR:
+
+  ld.so.1: a.out: fatal: libpcre.so.0: open failed: No such file or directory
+
+This is caused by the way shared library support works on those systems. You
+need to add
+
+  -R/usr/local/lib
+
+to the compile command to get round this problem.
+
+.in 0
+Last updated: 28 January 2003
+.br
+Copyright (c) 1997-2003 University of Cambridge.