You can try this as well:
if (*warnet@* iswm $address($nick,3)) {
First, $address by itself uses your own address. You'd need $address($nick,_) to get the nick's address (using whatever mask number you like). Second, I'm not entirely certain that 3 *'s work. Maybe they do. In either case, the above wildcard match is all you need anyhow. Including *! doesn't make it match any differently.
