Login.Register RegExp

[[!UpdateProfile?
    &submitVar=`updatememberbtn`
    &user=`[[!getReqParam? &name=`user_id` &type=`REQUEST`]]`
    &preHooks = `onBeforeMemberCreate`
    &postHooks = `onAfterMemberCreate`
    &reloadOnSuccess = `0`
    &useExtended=`0`
    &validate=`
	spam:blank,
	username:required,
	card_type:required:isNumber,
	firstname:required,
	lastname:required,
	gender:required:isNumber,
	dob:required:regexp=^\d{1,2}\/\d{1,2}\/\d{4}$,
	email:email:required,
	mobilephone:required:regexp=^((\+|00)33\s?|0)[679](\s?\d{2}){4}$,
	zip:required:regexp=^0[1-9]|[1-8][0-9]|9[0-8]|2A|2B[0-9]{3}$`
]]

    public function regexp($key,$value,$expression) {
        echo $expression;
		die;
    	preg_match($expression,$value,$matches);
        return !empty($matches) && !empty($matches[0]) == true ? true : $this->_getErrorMessage($key,'vTextRegexp','register.not_regexp',array(
            'field' => $key,
            'value' => $value,
            'regexp' => $expression,
        ));
    }