I’m trying to use the um_validation_safe_username_regex filter (see below) to limit registration usernames only to alphanumeric characters. I’m enacting it as a Snippet and activating it. But Ultimate Member is allowing users to continue registering with the dashes, spaces, underscores, etc.
function um_custom_validation_safe_username( $regex_safe ) {
$regex_safe="/^[A-Za-z0-9]+$/";
return $regex_safe;
}
add_filter( 'um_validation_safe_username_regex', 'um_custom_validation_safe_username', 10, 1 );
Does this filter only add additional characters to allow, or can it be used to further restrict? I don’t understand why it’s not working.
