PCRE - Perl Compatible Regular Expressions

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PCRE库是一组实现正则表达式模式匹配的函数，使用与Perl 5相同的语法和语义。它拥有自己的API，并提供了一套对应POSIX正则表达式API的包装函数。该库是免费的，可用于构建商业软件。PCRE最初为Exim MTA开发，现已被多个开源项目及知名商业产品采用。

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转自：http://www.pcre.org/

The PCRE library is a set of functions that implement regular expression pattern matching using the same syntax and semantics as Perl 5. PCRE has its own native API, as well as a set of wrapper functions that correspond to the POSIX regular expression API. The PCRE library is free, even for building commercial software.

PCRE was originally written for the Exim MTA, but is now used by many high-profile open source projects, including Apache, PHP, KDE, Postfix, Analog, and Nmap. PCRE has also found its way into some well known commercial products, like Apple Safari. Some other interesting projects using PCRE include Chicken, Ferite, Onyx, Hypermail, Leafnode, Askemos, and Wenlin.