Guice servlet DSL, filter all but one URL

I want to filter all requests to my web application through my "SecurityFilter" which checks that a session variable "authToken" is valid. The problem is that in order to get this token you need to hit the "AuthServlet" which is at /auth.

I need to filter all servlets except the /auth servlet with my "SecurityFilter". How can I do this via guice-servlet?

I thought of trying to no avail...

filterRegex("!((.)*auth(.)*)").through(P开发者_StackOverflow社区ortSecurityFilter.class);

^((?!/authorize).)*$ worked.