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<?php $usernames = array('asdasd123', 'asdas_asdasd123', 'asdsad--asdsa123123', 'asdasd<><><>'); foreach($usernames as $u) { if(preg_match('/[A-Za-z0-9\-\_]+/', $u)) { echo $u.' is totally valid '; } else { echo $u. 'is not valid '; } }
Output for 4.3.0 - 7.3.0rc4
asdasd123 is totally valid asdas_asdasd123 is totally valid asdsad--asdsa123123 is totally valid asdasd<><><> is totally valid