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Diffstat (limited to 'doc/html/pcre2sample.html')
| -rw-r--r-- | doc/html/pcre2sample.html | 46 |
1 files changed, 25 insertions, 21 deletions
diff --git a/doc/html/pcre2sample.html b/doc/html/pcre2sample.html index 60a928b..2b36f1f 100644 --- a/doc/html/pcre2sample.html +++ b/doc/html/pcre2sample.html @@ -24,12 +24,11 @@ documentation. If you do not have a copy of the PCRE2 distribution, you can save this listing to re-create the contents of <i>pcre2demo.c</i>. </P> <P> -The demonstration program, which uses the PCRE2 8-bit library, compiles the -regular expression that is its first argument, and matches it against the -subject string in its second argument. No PCRE2 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. +The demonstration program compiles the regular expression that is its +first argument, and matches it against the subject string in its second +argument. No PCRE2 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 @@ -38,34 +37,39 @@ 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> +The code in <b>pcre2demo.c</b> is an 8-bit program that uses the PCRE2 8-bit +library. It handles strings and characters that are stored in 8-bit code units. +By default, one character corresponds to one code unit, but if the pattern +starts with "(*UTF)", both it and the subject are treated as UTF-8 strings, +where characters may occupy multiple code units. +</P> +<P> If PCRE2 is installed in the standard include and library directories for your operating system, you should be able to compile the demonstration program using -this command: +a command like this: <pre> - gcc -o pcre2demo pcre2demo.c -lpcre2-8 + cc -o pcre2demo pcre2demo.c -lpcre2-8 </pre> If PCRE2 is installed elsewhere, you may need to add additional options to the command line. For example, on a Unix-like system that has PCRE2 installed in <i>/usr/local</i>, you can compile the demonstration program using a command like this: <pre> - gcc -o pcre2demo -I/usr/local/include pcre2demo.c -L/usr/local/lib -lpcre2-8 - -</PRE> -</P> -<P> -Once you have compiled and linked the demonstration program, you can run simple -tests like this: + cc -o pcre2demo -I/usr/local/include pcre2demo.c -L/usr/local/lib -lpcre2-8 +</pre> +Once you have built the demonstration program, you can run simple tests like +this: <pre> ./pcre2demo 'cat|dog' 'the cat sat on the mat' ./pcre2demo -g 'cat|dog' 'the dog sat on the cat' </pre> Note that there is a much more comprehensive test program, called <a href="pcre2test.html"><b>pcre2test</b>,</a> -which supports many more facilities for testing regular expressions using the -PCRE2 libraries. The +which supports many more facilities for testing regular expressions using all +three PCRE2 libraries (8-bit, 16-bit, and 32-bit, though not all three need be +installed). The <a href="pcre2demo.html"><b>pcre2demo</b></a> -program is provided as a simple coding example. +program is provided as a relatively simple coding example. </P> <P> If you try to run @@ -73,7 +77,7 @@ If you try to run when PCRE2 is not installed in the standard library directory, you may get an error like this on some operating systems (e.g. Solaris): <pre> - ld.so.1: a.out: fatal: libpcre2.so.0: open failed: No such file or directory + ld.so.1: pcre2demo: fatal: libpcre2-8.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 @@ -97,9 +101,9 @@ Cambridge, England. REVISION </b><br> <P> -Last updated: 20 October 2014 +Last updated: 02 February 2016 <br> -Copyright © 1997-2014 University of Cambridge. +Copyright © 1997-2016 University of Cambridge. <br> <p> Return to the <a href="index.html">PCRE2 index page</a>. |