You don't need to support alias domains. They redirect to *.stackexchange.com domains, anyway.
This will match all current Stack Exchange sites. It uses @match for smarter domain and path wildcards. @match also works better for Chrome:
// @match http://*.askubuntu.com/*
// @match http://*.mathoverflow.net/*
// @match http://*.onstartups.com/*
// @match http://*.serverfault.com/*
// @match http://*.stackapps.com/*
// @match http://*.stackexchange.com/*
// @match http://*.stackoverflow.com/*
// @match http://*.superuser.com/*
