requirements

# File actionpack/lib/action_dispatch/routing/deprecated_mapper.rb, line 237
        def requirements(with_id = false)
          @requirements   ||= @options[:requirements] || {}
          @id_requirement ||= { :id => @requirements.delete(:id) || /[^#{Routing::SEPARATORS.join}]+/ }

          with_id ? @requirements.merge(@id_requirement) : @requirements
        end