POSIX Extended Regular Expression Functions
These functions all take a regular expression string as their first argument. PHP uses the POSIX extended regular expressions as defined by POSIX 1003.2. For a full description of POSIX regular expressions, see the regex man pages included in the regex directory in the PHP distribution. These man pages are usually in section 7, so to view them run one of the following commands (depending on your system):
man 7 regex man -s 7 regex
A basic lesson on POSIX regular expressions is available at www.delorie.com/gnu/docs/rx/rx_3.html, and a tutorial-style introduction can be found at www.htmlwizard.net/resources/tutorials/regex_intro.html.
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