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[#1] Daniel Klein [2012-03-22 01:01:06]
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);
[#2] Ray dot Paseur at Gmail dot com [2011-10-28 14:04:51]
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