regex help

[eluser]Thorpe Obazee[/eluser]
How can I use the CI routing to figure out this.

Every URL with the controller, user, that does not have the method, 'register' and 'login' should be routed to 'user/view/$1

$route['user/[^register]'] = "user/view/$1";

I currently have this and I know this doesn't work. It produces a 404 when I go to 'user/username' but is ok when I go to 'user/register'.