doc/html/pcresample.html

<html>
<head>
<title>pcresample specification</title>
</head>
<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
<h1>pcresample man page</h1>
<p>
Return to the <a href="index.html">PCRE index page</a>.
</p>
<p>
This page is part of the PCRE HTML documentation. It was generated automatically
from the original man page. If there is any nonsense in it, please consult the
man page, in case the conversion went wrong.
<br>
<br><b>
PCRE SAMPLE PROGRAM
</b><br>
<P>
A simple, complete demonstration program, to get you started with using PCRE,
is supplied in the file <i>pcredemo.c</i> in the PCRE distribution.
</P>
<P>
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.
</P>
<P>
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.
</P>
<P>
If PCRE is installed in the standard include and library directories for your
system, you should be able to compile the demonstration program using this
command:
<pre>
  gcc -o pcredemo pcredemo.c -lpcre
</pre>
If PCRE is installed elsewhere, you may need to add additional options to the
command line. For example, on a Unix-like system that has PCRE installed in
<i>/usr/local</i>, you can compile the demonstration program using a command
like this:
<pre>
  gcc -o pcredemo -I/usr/local/include pcredemo.c -L/usr/local/lib -lpcre
</pre>
Once you have compiled the demonstration program, you can run simple tests like
this:
<pre>
  ./pcredemo 'cat|dog' 'the cat sat on the mat'
  ./pcredemo -g 'cat|dog' 'the dog sat on the cat'
</pre>
Note that there is a much more comprehensive test program, called
<a href="pcretest.html"><b>pcretest</b>,</a>
which supports many more facilities for testing regular expressions and the
PCRE library. The <b>pcredemo</b> program is provided as a simple coding
example.
</P>
<P>
On some operating systems (e.g. Solaris), when PCRE is not installed in the
standard library directory, you may get an error like this when you try to run
<b>pcredemo</b>:
<pre>
  ld.so.1: a.out: fatal: libpcre.so.0: open failed: No such file or directory
</pre>
This is caused by the way shared library support works on those systems. You
need to add
<pre>
  -R/usr/local/lib
</pre>
(for example) to the compile command to get round this problem.
</P>
<P>
Last updated: 09 September 2004
<br>
Copyright &copy; 1997-2004 University of Cambridge.
<p>
Return to the <a href="index.html">PCRE index page</a>.
</p>
1	nigel	63	<html>
2			<head>
3			<title>pcresample specification</title>
4			</head>
5			<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
6	nigel	75	<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	nigel	63	<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	nigel	75	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	nigel	63	<pre>
40	nigel	75	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	nigel	63	<pre>
47	nigel	75	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	nigel	63	./pcredemo 'cat\|dog' 'the cat sat on the mat'
53			./pcredemo -g 'cat\|dog' 'the dog sat on the cat'
54	nigel	75	</pre>
55	nigel	63	Note that there is a much more comprehensive test program, called
56	nigel	75	<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	nigel	63	</P>
61			<P>
62	nigel	75	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	nigel	63	<pre>
66			ld.so.1: a.out: fatal: libpcre.so.0: open failed: No such file or directory
67	nigel	75	</pre>
68	nigel	63	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	nigel	75	</pre>
73			(for example) to the compile command to get round this problem.
74	nigel	63	</P>
75			<P>
76	nigel	75	Last updated: 09 September 2004
77	nigel	63	<br>
78	nigel	75	Copyright © 1997-2004 University of Cambridge.
79			<p>
80			Return to the <a href="index.html">PCRE index page</a>.
81			</p>