| Tristan Matthews | 0461646 | 2013-11-14 16:09:34 -0500 | [diff] [blame] | 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 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> |