Wildcard in route parameter regexp

Problem

Route `'/:username([a-z][a-z-])'` Route `'/:username([a-z][a-z-])/:project([a-z][a-z0-9-])'` URL `/someone/project` Expectation is that the second route should match. Actual result is the first route matches because the \ is considered as all the things rather than "zero or more" `[a-z-]`.