doc/html/pcresample.html

<html>
<head>
<title>pcresample specification</title>
</head>
<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
This HTML document has been 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>
<ul>
<li><a name="TOC1" href="#SEC1">PCRE SAMPLE PROGRAM</a>
</ul>
<br><a name="SEC1" href="#TOC1">PCRE SAMPLE PROGRAM</a><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>
On a Unix system that has PCRE installed in <i>/usr/local</i>, you can compile
the demonstration program using a command like this:
</P>
<P>
<pre>
  gcc -o pcredemo pcredemo.c -I/usr/local/include \
      -L/usr/local/lib -lpcre
</PRE>
</P>
<P>
Then you can run simple tests like this:
</P>
<P>
<pre>
  ./pcredemo 'cat|dog' 'the cat sat on the mat'
  ./pcredemo -g 'cat|dog' 'the dog sat on the cat'
</PRE>
</P>
<P>
Note that there is a much more comprehensive test program, called
<b>pcretest</b>, 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) you may get an error like this when
you try to run <b>pcredemo</b>:
</P>
<P>
<pre>
  ld.so.1: a.out: fatal: libpcre.so.0: open failed: No such file or directory
</PRE>
</P>
<P>
This is caused by the way shared library support works on those systems. You
need to add
</P>
<P>
<pre>
  -R/usr/local/lib
</PRE>
</P>
<P>
to the compile command to get round this problem.
</P>
<P>
Last updated: 28 January 2003
<br>
Copyright &copy; 1997-2003 University of Cambridge.
1	<html>
2	<head>
3	<title>pcresample specification</title>
4	</head>
5	<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
6	This HTML document has been generated automatically from the original man page.
7	If there is any nonsense in it, please consult the man page, in case the
8	conversion went wrong.<br>
9	<ul>
10	<li><a name="TOC1" href="#SEC1">PCRE SAMPLE PROGRAM</a>
11	</ul>
12	<br><a name="SEC1" href="#TOC1">PCRE SAMPLE PROGRAM</a><br>
13	<P>
14	A simple, complete demonstration program, to get you started with using PCRE,
15	is supplied in the file <i>pcredemo.c</i> in the PCRE distribution.
16	</P>
17	<P>
18	The program compiles the regular expression that is its first argument, and
19	matches it against the subject string in its second argument. No PCRE options
20	are set, and default character tables are used. If matching succeeds, the
21	program outputs the portion of the subject that matched, together with the
22	contents of any captured substrings.
23	</P>
24	<P>
25	If the -g option is given on the command line, the program then goes on to
26	check for further matches of the same regular expression in the same subject
27	string. The logic is a little bit tricky because of the possibility of matching
28	an empty string. Comments in the code explain what is going on.
29	</P>
30	<P>
31	On a Unix system that has PCRE installed in <i>/usr/local</i>, you can compile
32	the demonstration program using a command like this:
33	</P>
34	<P>
35	<pre>
36	gcc -o pcredemo pcredemo.c -I/usr/local/include \
37	-L/usr/local/lib -lpcre
38	</PRE>
39	</P>
40	<P>
41	Then you can run simple tests like this:
42	</P>
43	<P>
44	<pre>
45	./pcredemo 'cat\|dog' 'the cat sat on the mat'
46	./pcredemo -g 'cat\|dog' 'the dog sat on the cat'
47	</PRE>
48	</P>
49	<P>
50	Note that there is a much more comprehensive test program, called
51	<b>pcretest</b>, which supports many more facilities for testing regular
52	expressions and the PCRE library. The <b>pcredemo</b> program is provided as a
53	simple coding example.
54	</P>
55	<P>
56	On some operating systems (e.g. Solaris) you may get an error like this when
57	you try to run <b>pcredemo</b>:
58	</P>
59	<P>
60	<pre>
61	ld.so.1: a.out: fatal: libpcre.so.0: open failed: No such file or directory
62	</PRE>
63	</P>
64	<P>
65	This is caused by the way shared library support works on those systems. You
66	need to add
67	</P>
68	<P>
69	<pre>
70	-R/usr/local/lib
71	</PRE>
72	</P>
73	<P>
74	to the compile command to get round this problem.
75	</P>
76	<P>
77	Last updated: 28 January 2003
78	<br>
79	Copyright © 1997-2003 University of Cambridge.