Regular Expression Pocket Reference, 2nd Edition

PHP

This reference covers PHP 4.4.3 and 5.1.4’s Perl-style regular expression support contained within the preg routines. Both are based on the PCRE 6.6 library. The preg routines use a Traditional NFA match engine. For an explanation of the rules behind an NFA engine, see "Introduction to Regexes and Pattern Matching.”