Inadequate documentation on routing

[smcmurray]

http://vibed.org/docs#http-routing has almost no information about how to construct a proper pattern for route matching. The sum total is two sentences:

It supports static path matching, variable placeholders and wild-cards. Any matched variable will be available as an entry in the params dictionary.

What are variable placeholders? What are wild-cards?

Can I match "/users?:name"?
Can I match "user/:last,:first"?
Can I match regex(r"/user/(\d+)")?
Can I match "/user//dept"?
Can I match "/user//dept/*"?