preg_match Question

[Rollo_Tamasi]

Hi lads. At the moment i have the preg_match function blocking users from signing up with first names such as ££%^£ in my script. How would i modify this code

function check_first_name($first_name){
		if(!preg_match("/[^a-zA-Z0-9\.\-\ß\ä\Ä\ü\Ü\ö\Ö\ ]+$/s",$first_name)) return TRUE;
			else return FALSE;
		}

to prevent users from signing up with the name 353£"£%^£
Thanks

[Weedpacket]

What characters do you want them to use? Wouldn't that be a more robust approach? Return false if anything else appears.

function check_first_name($first_name){
        return !preg_match("/[^allowed-characters]/",$first_name));
} 

[Rollo_Tamasi]

so the correct code would be

function check_first_name($first_name){
        return !preg_match("/[^A-Za-z0-9]/",$first_name));
} 

????

[Weedpacket]

Are A-Za-z0-9 the characters they're allowed?