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1 <html>
2 <head>
3 <title>pcresample specification</title>
4 </head>
5 <body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
6 <h1>pcresample man page</h1>
7 <p>
8 Return to the <a href="index.html">PCRE index page</a>.
9 </p>
10 <p>
11 This page is part of the PCRE HTML documentation. It was generated automatically
12 from the original man page. If there is any nonsense in it, please consult the
13 man page, in case the conversion went wrong.
14 <br>
15 <br><b>
17 </b><br>
18 <P>
19 A simple, complete demonstration program, to get you started with using PCRE,
20 is supplied in the file <i>pcredemo.c</i> in the PCRE distribution.
21 </P>
22 <P>
23 The program compiles the regular expression that is its first argument, and
24 matches it against the subject string in its second argument. No PCRE options
25 are set, and default character tables are used. If matching succeeds, the
26 program outputs the portion of the subject that matched, together with the
27 contents of any captured substrings.
28 </P>
29 <P>
30 If the -g option is given on the command line, the program then goes on to
31 check for further matches of the same regular expression in the same subject
32 string. The logic is a little bit tricky because of the possibility of matching
33 an empty string. Comments in the code explain what is going on.
34 </P>
35 <P>
36 If PCRE is installed in the standard include and library directories for your
37 system, you should be able to compile the demonstration program using this
38 command:
39 <pre>
40 gcc -o pcredemo pcredemo.c -lpcre
41 </pre>
42 If PCRE is installed elsewhere, you may need to add additional options to the
43 command line. For example, on a Unix-like system that has PCRE installed in
44 <i>/usr/local</i>, you can compile the demonstration program using a command
45 like this:
46 <pre>
47 gcc -o pcredemo -I/usr/local/include pcredemo.c -L/usr/local/lib -lpcre
48 </pre>
49 Once you have compiled the demonstration program, you can run simple tests like
50 this:
51 <pre>
52 ./pcredemo 'cat|dog' 'the cat sat on the mat'
53 ./pcredemo -g 'cat|dog' 'the dog sat on the cat'
54 </pre>
55 Note that there is a much more comprehensive test program, called
56 <a href="pcretest.html"><b>pcretest</b>,</a>
57 which supports many more facilities for testing regular expressions and the
58 PCRE library. The <b>pcredemo</b> program is provided as a simple coding
59 example.
60 </P>
61 <P>
62 On some operating systems (e.g. Solaris), when PCRE is not installed in the
63 standard library directory, you may get an error like this when you try to run
64 <b>pcredemo</b>:
65 <pre>
66 ld.so.1: a.out: fatal: libpcre.so.0: open failed: No such file or directory
67 </pre>
68 This is caused by the way shared library support works on those systems. You
69 need to add
70 <pre>
71 -R/usr/local/lib
72 </pre>
73 (for example) to the compile command to get round this problem.
74 </P>
75 <br><b>
77 </b><br>
78 <P>
79 Philip Hazel
80 <br>
81 University Computing Service
82 <br>
83 Cambridge CB2 3QH, England.
84 <br>
85 </P>
86 <br><b>
88 </b><br>
89 <P>
90 Last updated: 23 January 2008
91 <br>
92 Copyright &copy; 1997-2008 University of Cambridge.
93 <br>
94 <p>
95 Return to the <a href="index.html">PCRE index page</a>.
96 </p>


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