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2: <head>
3: <title>pcresample specification</title>
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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>
16: PCRE SAMPLE PROGRAM
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. A listing of
21: this program is given in the
22: <a href="pcredemo.html"><b>pcredemo</b></a>
23: documentation. If you do not have a copy of the PCRE distribution, you can save
24: this listing to re-create <i>pcredemo.c</i>.
25: </P>
26: <P>
27: The program compiles the regular expression that is its first argument, and
28: matches it against the subject string in its second argument. No PCRE options
29: are set, and default character tables are used. If matching succeeds, the
30: program outputs the portion of the subject that matched, together with the
31: contents of any captured substrings.
32: </P>
33: <P>
34: If the -g option is given on the command line, the program then goes on to
35: check for further matches of the same regular expression in the same subject
36: string. The logic is a little bit tricky because of the possibility of matching
37: an empty string. Comments in the code explain what is going on.
38: </P>
39: <P>
40: If PCRE is installed in the standard include and library directories for your
41: operating system, you should be able to compile the demonstration program using
42: this command:
43: <pre>
44: gcc -o pcredemo pcredemo.c -lpcre
45: </pre>
46: If PCRE is installed elsewhere, you may need to add additional options to the
47: command line. For example, on a Unix-like system that has PCRE installed in
48: <i>/usr/local</i>, you can compile the demonstration program using a command
49: like this:
50: <pre>
51: gcc -o pcredemo -I/usr/local/include pcredemo.c -L/usr/local/lib -lpcre
52: </pre>
53: In a Windows environment, if you want to statically link the program against a
54: non-dll <b>pcre.a</b> file, you must uncomment the line that defines PCRE_STATIC
55: before including <b>pcre.h</b>, because otherwise the <b>pcre_malloc()</b> and
56: <b>pcre_free()</b> exported functions will be declared
57: <b>__declspec(dllimport)</b>, with unwanted results.
58: </P>
59: <P>
60: Once you have compiled and linked the demonstration program, you can run simple
61: tests like this:
62: <pre>
63: ./pcredemo 'cat|dog' 'the cat sat on the mat'
64: ./pcredemo -g 'cat|dog' 'the dog sat on the cat'
65: </pre>
66: Note that there is a much more comprehensive test program, called
67: <a href="pcretest.html"><b>pcretest</b>,</a>
68: which supports many more facilities for testing regular expressions and the
69: PCRE library. The
70: <a href="pcredemo.html"><b>pcredemo</b></a>
71: program is provided as a simple coding example.
72: </P>
73: <P>
74: If you try to run
75: <a href="pcredemo.html"><b>pcredemo</b></a>
76: when PCRE is not installed in the standard library directory, you may get an
77: error like this on some operating systems (e.g. Solaris):
78: <pre>
79: ld.so.1: a.out: fatal: libpcre.so.0: open failed: No such file or directory
80: </pre>
81: This is caused by the way shared library support works on those systems. You
82: need to add
83: <pre>
84: -R/usr/local/lib
85: </pre>
86: (for example) to the compile command to get round this problem.
87: </P>
88: <br><b>
89: AUTHOR
90: </b><br>
91: <P>
92: Philip Hazel
93: <br>
94: University Computing Service
95: <br>
96: Cambridge CB2 3QH, England.
97: <br>
98: </P>
99: <br><b>
100: REVISION
101: </b><br>
102: <P>
103: Last updated: 17 November 2010
104: <br>
105: Copyright © 1997-2010 University of Cambridge.
106: <br>
107: <p>
108: Return to the <a href="index.html">PCRE index page</a>.
109: </p>
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