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> 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 demonstration program, which uses the original PCRE 8-bit library, compiles 28 the regular expression that is its first argument, and matches it against the 29 subject string in its second argument. No PCRE options are set, and default 30 character tables are used. If matching succeeds, the program outputs the 31 portion of the subject that matched, together with the contents of any captured 32 substrings. 33 </P> 34 <P> 35 If the -g option is given on the command line, the program then goes on to 36 check for further matches of the same regular expression in the same subject 37 string. The logic is a little bit tricky because of the possibility of matching 38 an empty string. Comments in the code explain what is going on. 39 </P> 40 <P> 41 If PCRE is installed in the standard include and library directories for your 42 operating system, you should be able to compile the demonstration program using 43 this command: 44 <pre> 45 gcc -o pcredemo pcredemo.c -lpcre 46 </pre> 47 If PCRE is installed elsewhere, you may need to add additional options to the 48 command line. For example, on a Unix-like system that has PCRE installed in 49 <i>/usr/local</i>, you can compile the demonstration program using a command 50 like this: 51 <pre> 52 gcc -o pcredemo -I/usr/local/include pcredemo.c -L/usr/local/lib -lpcre 53 </pre> 54 In a Windows environment, if you want to statically link the program against a 55 non-dll <b>pcre.a</b> file, you must uncomment the line that defines PCRE_STATIC 56 before including <b>pcre.h</b>, because otherwise the <b>pcre_malloc()</b> and 57 <b>pcre_free()</b> exported functions will be declared 58 <b>__declspec(dllimport)</b>, with unwanted results. 59 </P> 60 <P> 61 Once you have compiled and linked the demonstration program, you can run simple 62 tests like this: 63 <pre> 64 ./pcredemo 'cat|dog' 'the cat sat on the mat' 65 ./pcredemo -g 'cat|dog' 'the dog sat on the cat' 66 </pre> 67 Note that there is a much more comprehensive test program, called 68 <a href="pcretest.html"><b>pcretest</b>,</a> 69 which supports many more facilities for testing regular expressions and both 70 PCRE libraries. The 71 <a href="pcredemo.html"><b>pcredemo</b></a> 72 program is provided as a simple coding example. 73 </P> 74 <P> 75 If you try to run 76 <a href="pcredemo.html"><b>pcredemo</b></a> 77 when PCRE is not installed in the standard library directory, you may get an 78 error like this on some operating systems (e.g. Solaris): 79 <pre> 80 ld.so.1: a.out: fatal: libpcre.so.0: open failed: No such file or directory 81 </pre> 82 This is caused by the way shared library support works on those systems. You 83 need to add 84 <pre> 85 -R/usr/local/lib 86 </pre> 87 (for example) to the compile command to get round this problem. 88 </P> 89 <br><b> 90 AUTHOR 91 </b><br> 92 <P> 93 Philip Hazel 94 <br> 95 University Computing Service 96 <br> 97 Cambridge CB2 3QH, England. 98 <br> 99 </P> 100 <br><b> 101 REVISION 102 </b><br> 103 <P> 104 Last updated: 10 January 2012 105 <br> 106 Copyright © 1997-2012 University of Cambridge. 107 <br> 108 <p> 109 Return to the <a href="index.html">PCRE index page</a>. 110 </p> 111
