/[pcre]/code/tags/pcre-6.7/doc/pcresample.3
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Contents of /code/tags/pcre-6.7/doc/pcresample.3

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Revision 92 - (hide annotations) (download)
Sat Feb 24 21:41:36 2007 UTC (7 years, 5 months ago) by nigel
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Tag code/trunk as code/tags/pcre-6.7.

1 nigel 79 .TH PCRESAMPLE 3
2 nigel 63 .SH NAME
3     PCRE - Perl-compatible regular expressions
4 nigel 75 .SH "PCRE SAMPLE PROGRAM"
5 nigel 63 .rs
6     .sp
7     A simple, complete demonstration program, to get you started with using PCRE,
8 nigel 75 is supplied in the file \fIpcredemo.c\fP in the PCRE distribution.
9     .P
10 nigel 63 The program compiles the regular expression that is its first argument, and
11     matches it against the subject string in its second argument. No PCRE options
12     are set, and default character tables are used. If matching succeeds, the
13     program outputs the portion of the subject that matched, together with the
14     contents of any captured substrings.
15 nigel 75 .P
16 nigel 63 If the -g option is given on the command line, the program then goes on to
17     check for further matches of the same regular expression in the same subject
18     string. The logic is a little bit tricky because of the possibility of matching
19     an empty string. Comments in the code explain what is going on.
20 nigel 75 .P
21     If PCRE is installed in the standard include and library directories for your
22     system, you should be able to compile the demonstration program using this
23     command:
24     .sp
25     gcc -o pcredemo pcredemo.c -lpcre
26     .sp
27     If PCRE is installed elsewhere, you may need to add additional options to the
28     command line. For example, on a Unix-like system that has PCRE installed in
29     \fI/usr/local\fP, you can compile the demonstration program using a command
30     like this:
31     .sp
32     .\" JOINSH
33     gcc -o pcredemo -I/usr/local/include pcredemo.c \e
34 nigel 63 -L/usr/local/lib -lpcre
35 nigel 75 .sp
36     Once you have compiled the demonstration program, you can run simple tests like
37     this:
38     .sp
39 nigel 63 ./pcredemo 'cat|dog' 'the cat sat on the mat'
40     ./pcredemo -g 'cat|dog' 'the dog sat on the cat'
41 nigel 75 .sp
42 nigel 63 Note that there is a much more comprehensive test program, called
43 nigel 75 .\" HREF
44     \fBpcretest\fP,
45     .\"
46     which supports many more facilities for testing regular expressions and the
47     PCRE library. The \fBpcredemo\fP program is provided as a simple coding
48     example.
49     .P
50     On some operating systems (e.g. Solaris), when PCRE is not installed in the
51     standard library directory, you may get an error like this when you try to run
52     \fBpcredemo\fP:
53     .sp
54 nigel 63 ld.so.1: a.out: fatal: libpcre.so.0: open failed: No such file or directory
55 nigel 75 .sp
56 nigel 63 This is caused by the way shared library support works on those systems. You
57     need to add
58 nigel 75 .sp
59 nigel 63 -R/usr/local/lib
60 nigel 75 .sp
61     (for example) to the compile command to get round this problem.
62     .P
63 nigel 63 .in 0
64 nigel 75 Last updated: 09 September 2004
65 nigel 63 .br
66 nigel 75 Copyright (c) 1997-2004 University of Cambridge.

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