How to create a conditional route

how can I create a conditional route that work for the following:

http://site.com/1vcs1YUf1Z

Where 1vcs1YUf1Z is a UID.

Is there a way I can add a routing option to the end of my route file that says if the following condition is met (10 characters trailing the first / and that's it) then to route to the开发者_开发百科 following and pass that as the UID?

Thanks

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get 'projects/:uid' => 'controller#action',
  :constraints => { :uid => /^[0-9a-z]{10}$/i }