remove the https:// from user_contactmethods

hi . i add some filed to user form with this code :

function modify_contact_methods($profile_fields) {
	$profile_fields['digreepost'] = '????';
	$profile_fields['cityofuser'] = '??? / ?????';
	$profile_fields['idyahoomessenger'] = '???? ????';
	$profile_fields['expdateshowpost'] = '????? ?????';
	return $profile_fields;
}
add_filter('user_contactmethods', 'modify_contact_methods');

but this save the value with https://
i could remove that with str_replace but i want use without it.