PCRE(Perl Compatible Regular Expressions)是一个轻量级的Perl函数库，包括 perl 兼容的正则表达式库。它比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。(The PCRE(Perl Compatible Regular Expressions) is a lightweight Perl library, including a Perl compliant Regu