PCRE Lib
The Perl Compatible Regular Expression (PCRE) library is a free-for-any-use, open source regular expression library developed by Philip Hazel. PCRE has been incorporated into PHP, Apache 2.0, KDE, Exim MTA, Analog, and Postfix. Users of those programs can use the supported metacharacters listed in Table 1-26 through Table 1-30.
The PCRE library uses a Traditional NFA match engine. For an explanation of the rules behind an NFA engine, see Section 1.2.
This reference covers PCRE Version 4.0, which aims to emulate Perl 5.8-style regular expressions.
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