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PHP Manual

Regular Expression (POSIX Extended)

User Contributed Notes

Daniel Klein 22-Mar-2012 10:01
PCRE has very good utf-8 support. Simply add the /u modifier to your pattern.

preg_match('/non-utf-8 matching pattern/', $string);
preg_match('/utf-8 matching pattern/u', $string);
Ray dot Paseur at Gmail dot com 28-Oct-2011 11:04
The POSIX functions are deprecated.  Instead of the "ereg" collection you want to use something from the PCRE world.
http://www.php.net/manual/en/book.pcre.php

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