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Revision 181 - (hide annotations) (download)
Wed Jun 13 14:55:18 2007 UTC (6 years, 10 months ago) by ph10
File size: 2642 byte(s)
Documentation update preparatory to release.

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 ph10 181 The demonstration program is automatically built if you use "./configure;make"
22     to build PCRE. Otherwise, if PCRE is installed in the standard include and
23     library directories for your system, you should be able to compile the
24     demonstration program using this command:
25 nigel 75 .sp
26     gcc -o pcredemo pcredemo.c -lpcre
27     .sp
28     If PCRE is installed elsewhere, you may need to add additional options to the
29     command line. For example, on a Unix-like system that has PCRE installed in
30     \fI/usr/local\fP, you can compile the demonstration program using a command
31     like this:
32     .sp
33     .\" JOINSH
34     gcc -o pcredemo -I/usr/local/include pcredemo.c \e
35 nigel 63 -L/usr/local/lib -lpcre
36 nigel 75 .sp
37     Once you have compiled the demonstration program, you can run simple tests like
38     this:
39     .sp
40 nigel 63 ./pcredemo 'cat|dog' 'the cat sat on the mat'
41     ./pcredemo -g 'cat|dog' 'the dog sat on the cat'
42 nigel 75 .sp
43 nigel 63 Note that there is a much more comprehensive test program, called
44 nigel 75 .\" HREF
45     \fBpcretest\fP,
46     .\"
47     which supports many more facilities for testing regular expressions and the
48     PCRE library. The \fBpcredemo\fP program is provided as a simple coding
49     example.
50     .P
51     On some operating systems (e.g. Solaris), when PCRE is not installed in the
52     standard library directory, you may get an error like this when you try to run
53     \fBpcredemo\fP:
54     .sp
55 nigel 63 ld.so.1: a.out: fatal: libpcre.so.0: open failed: No such file or directory
56 nigel 75 .sp
57 nigel 63 This is caused by the way shared library support works on those systems. You
58     need to add
59 nigel 75 .sp
60 nigel 63 -R/usr/local/lib
61 nigel 75 .sp
62     (for example) to the compile command to get round this problem.
63 ph10 99 .
64     .
65     .SH AUTHOR
66     .rs
67     .sp
68     .nf
69     Philip Hazel
70     University Computing Service
71     Cambridge CB2 3QH, England.
72     .fi
73     .
74     .
75     .SH REVISION
76     .rs
77     .sp
78     .nf
79 ph10 181 Last updated: 13 June 2007
80 ph10 99 Copyright (c) 1997-2007 University of Cambridge.
81     .fi

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