note 102533 rejected from function.preg-match by danbrown

Note Submitter: adv at fotobase dot org ---- Please, help me! What is the valid regex for filtering logins? The login consists only from characters a-z A-Z, 0-9 but there is no whitespaces. for example somebody - valid login somebody123 - valid login 123somebody123 - valid login et cetera some body - invalid login these regexs doesn't works for me /[0-9A-Za-z]/i /[0-9a-Z]/i /[0-9a-Z^ ]/i /[0-9a-Z^\s]/i i use this code if (preg_match("/[0-9A-Za-z]/i",$login)) { $ok=1; }