Ruby on Rails

I have the following problem:
- I have a controller called UsersController and I need to restrict
the show URL to use only numbers, How can I do that?
my routes.rb has this line:
resources :users, :except=>[:destroy]
How I add this constraint in this line?
I know that there is a command :constraints, but I dont know how to
use in resources ;/
Thanks :D

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