Weird routing problem…

gistfile1.txt

$ rake routes
      domains GET    /domains                               domains#index
              POST   /domains                               domains#create
   new_domain GET    /domains/new                           domains#new {:domain=>/[0-z\.\-]+/}
  edit_domain GET    /domains/:domain/edit                  domains#edit {:domain=>/[0-z\.\-]+/}
       domain        /domains/:domain(.:format)             domains#show
              PUT    /domains/:domain                       domains#update {:domain=>/[0-z\.\-]+/}
              DELETE /domains/:domain                       domains#destroy {:domain=>/[0-z\.\-]+/}
    mailusers GET    /domains/:domain/mailusers             mailusers#index {:domain=>/[0-z\.\-]+/, :email=>/[0-z\.\-_@]+/}
              POST   /domains/:domain/mailusers             mailusers#create {:domain=>/[0-z\.\-]+/, :email=>/[0-z\.\-_@]+/}
 new_mailuser GET    /domains/:domain/mailusers/new         mailusers#new {:domain=>/[0-z\.\-]+/, :email=>/[0-z\.\-_@]+/}
edit_mailuser GET    /domains/:domain/mailusers/:email/edit mailusers#edit {:domain=>/[0-z\.\-]+/, :email=>/[0-z\.\-_@]+/}
     mailuser GET    /domains/:domain/mailusers/:email      mailusers#show {:domain=>/[0-z\.\-]+/, :email=>/[0-z\.\-_@]+/}
              PUT    /domains/:domain/mailusers/:email      mailusers#update {:domain=>/[0-z\.\-]+/, :email=>/[0-z\.\-_@]+/}
              DELETE /domains/:domain/mailusers             mailusers#destroy {:domain=>/[0-z\.\-]+/, :email=>/[0-z\.\-_@]+/}
         root        /                                      :controller#:action

--------- routes.rb

Ispmailadmin::Application.routes.draw do
  # I don't want numeric IDs. That's why I do all this punk with :domain instead of :id

  re_domain = /[0-z\.\-]+/
  re_email = /[0-z\.\-_@]+/

  match 'domains' => 'domains#index', :via => :get, :as => 'domains', :format => false
  match 'domains' => 'domains#create', :via => :post, :format => false
  match 'domains/new' => 'domains#new', :via => :get, :as => 'new_domain', :format => false, :domain => re_domain
  match 'domains/:domain/edit' => 'domains#edit', :via => :get, :as => 'edit_domain', :format => false, :domain => re_domain
  #match 'domains/:domain' => 'domains#show', :via => :get, :as => 'domain', :format => false, :domain => re_domain
  match 'domains/:domain', :to => 'domains#show', :as => 'domain'
  match 'domains/:domain' => 'domains#update', :via => :put, :format => false, :domain => re_domain
  match 'domains/:domain' => 'domains#destroy', :via => :delete, :format => false, :domain => re_domain

  match 'domains/:domain/mailusers' => 'mailusers#index', :via => :get, :as => 'mailusers', :format => false, :domain => re_domain, :email => re_email
  match 'domains/:domain/mailusers' => 'mailusers#create', :via => :post, :format => false, :domain => re_domain, :email => re_email
  match 'domains/:domain/mailusers/new' => 'mailusers#new', :via => :get, :as => 'new_mailuser', :format => false, :domain => re_domain, :email => re_email
  match 'domains/:domain/mailusers/:email/edit' => 'mailusers#edit', :via => :get, :as => 'edit_mailuser', :format => false, :domain => re_domain, :email => re_email
  match 'domains/:domain/mailusers/:email' => 'mailusers#show', :via => :get, :as => 'mailuser', :format => false, :domain => re_domain, :email => re_email
  match 'domains/:domain/mailusers/:email' => 'mailusers#update', :via => :put, :format => false, :domain => re_domain, :email => re_email
  match 'domains/:domain/mailusers' => 'mailusers#destroy', :via => :delete, :format => false, :domain => re_domain, :email => re_email

  root :to => redirect('/domains')
end

-------- View code:

    <td><%= link_to 'Show', domain %></td>