code: public SimpleUriRouter<I, O> addUriRegex(String uriRegEx, RequestHandler<I, O> handler) {
          routes.add(new Route(new RegexUriConstraintKey<I>(uriRegEx), handler));
          return this;
      }
docs: Add a new URI regex -&lt; Handler route to this router.
  @param uriRegEx URI regex to match
  @param handler Request handler.
  @return The updated router.