pcre-8.42.tar.gz
perl语言兼容正则表达式)是一个用C语言编写的正则表达式函数库，由菲利普.海泽(Philip Hazel)编写。PCRE是一个轻量级的函数库，比Boost之类的正则表达式库小得多。PCRE十分易用，同时功能也很强大，性能超过了POSIX正则表达式库和一些经典的正则表达式库 [1] 。
和Boost正则表达式库的比较显示 [2] ，双方的性能相差无几，PCRE在匹配简单字符串时更快，Boost则在匹配较长字符串时胜出---但两者差距很小，考虑到PCRE的大小和易用性，我们可以认为PCRE更值得考虑。
PCRE被广泛使用在许多开源软件之中，最著名的莫过于Apache HTTP服务器和PHP脚本语言、R脚本语言，此外，正如从其名字所能看到的，PCRE也是perl语言的缺省正则库。
PCRE是用C语言实现的，其C++实现版本是PCRE++。
代码片段和文件信息
/*************************************************
* Perl-Compatible Regular expressions *
*************************************************/
/* PCRE is a library of functions to support regular expressions whose syntax
and semantics are as close as possible to those of the Perl 5 language.
Written by Philip Hazel
Copyright （c） 1997-2012 University of Cambridge
-----------------------------------------------------------------------------
Redistribution and use in source and binary forms with or without
modification are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the University of Cambridge nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS“
AND ANY EXPRESS OR IMPLIED WARRANTIES INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT INDIRECT INCIDENTAL SPECIAL EXEMPLARY OR
CONSEQUENTIAL DAMAGES （INCLUDING BUT NOT LIMITED TO PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE DATA OR PROFITS; OR BUSINESS
INTERRUPTION） HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY WHETHER IN
CONTRACT STRICT LIABILITY OR TORT （INCLUDING NEGLIGENCE OR OTHERWISE）
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
-----------------------------------------------------------------------------
*/
/* This is a freestanding support program to generate a file containing
character tables for PCRE. The tables are built according to the current
locale. Now that pcre_maketables is a function visible to the outside world we
make use of its code from here in order to be consistent. */
#ifdef HAVE_CONFIG_H
#include “config.h“
#endif
#include
#include
#include
#include
#include “pcre_internal.h“
#define DFTABLES /* pcre_maketables.c notices this */
#include “pcre_maketables.c“
int main（int argc char **argv）
{
FILE *f;
int i = 1;
const unsigned char *tables;
const unsigned char *base_of_tables;
/* By default the default C locale is used rather than what the building user
happens to have set. However if the -L option is given set the locale from
the LC_xxx environment variables. */
if （argc > 1 && strcmp（argv[1] “-L“） == 0）
{
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