note 15432 added to function.preg-match

From: Date: Mon, 10 Sep 2001 15:52:15 +0000
Subject: note 15432 added to function.preg-match
Groups: php.notes 
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actually /\w/ matches alpha-numerics and _, so you may end up matching something you didn't want (namely, the underscore). http://www.php.net/manual/en/function.preg-match.php

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