How to correctly validate url?

From: Date: Wed, 18 Jan 2012 10:00:11 +0000
Subject: How to correctly validate url?
Groups: php.general 
Request: Send a blank email to php-general+get-316327@lists.php.net to get a copy of this message
Hello, how to correctly validate url? now the special local characters like ÜÕÖÄ etc are allowed as well... Br, Tanel

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