Searching a string or similar

From: Date: Fri, 28 Dec 2001 19:01:09 +0000
Subject: Searching a string or similar
Groups: php.general 
Request: Send a blank email to php-general+get-78961@lists.php.net to get a copy of this message
Hi i've taken a look throught he manual and i can't find a function to do this Basically i want to take in a string and check that the string doesn't contain a certain word or something ie check that it doesn't contain <SCRIPT LANGUAGE = Javascript> to prevent hackers/crackers on my guestbook Thanks Ash

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