the issue seems to be if I put :ids => /\d/ or :constraints=>{:ids => /\d/} then I get a RuntimeError (route set not finalized):

log

Started POST "/login.xml" for 127.0.0.1 at 2011-01-07 15:17:10 -0800

RuntimeError (route set not finalized):
  

Rendered /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.0.1/lib/action_dispatch/middleware/templates/rescues/_trace.erb (2.7ms)
Rendered /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.0.1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (2.6ms)
Rendered /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.0.1/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (12.2ms)

routes.rb

Api2::Application.routes.draw do
  
  match 'test/:action', :to => "test#:action"
  match 'search/:action/(*expand)', :to => "search#:action", :via => "get"   
  match 'uploads', :to => "uploads#fast_upload", :via => "post"
  
  match 'login', :to => "login#sign_in", :via => "post"
  match 'login', :to => "login#read", :via => "get"
  match 'login', :to => "login#sign_out", :via => "delete"  
  match 'signups/authenticate', :to => "signups#authenticate", :via => "get"
  match 'signups/validate', :to => "signups#validate", :via => "get"	
  	
  match ':controller', :to => ":controller#create", :via => "post"
  match ':controller', :to => ":controller#read", :via => "get"
  match ':controller/:ids/(*expand)', :to => ":controller#read",  :via => "get", :ids => /^\d/
  match ':controller/:ids', :to => ":controller#update", :via => "put"
  match ':controller/:ids', :to => ":controller#destroy", :via => "delete"

end