title: Subdomain constraint and excluding certain subdomains
body: <p>In my <code>routes.rb</code> file I want to use the subdomain constraints feature in rails3 however I would like to exclude certain domains from the catch all route. I dont want to have certain controller in a specific subdomain. What would be the best practice in doing so.</p>
  
  <pre><code># this subdomain i dont want all of the catch all routes
  constraints :subdomain =&gt; "signup" do
    resources :users
  end
  
  # here I want to catch all but exclude the "signup" subdomain
  constraints :subdomain =&gt; /.+/ do
    resources :cars
    resources :stations
  end
  </code></pre>