# /lib/routing_extensions.rb
module ThongKuah
module Routing

  module RouteExtensions
    def self.included(base)
      base.alias_method_chain :recognition_conditions, :path_regexp
    end

    # allows recognition for paths only matching the given regexp (conditions[:path])
    # allows recognition for paths not matching the given regexp (conditions[:not_path])
    def recognition_conditions_with_path_regexp
      result = recognition_conditions_without_path_regexp
      result << "conditions[:path] =~ path" if conditions[:path]
      result << "(conditions[:not_path]=~path).nil?" if conditions[:not_path]
      result
    end
  end

end
end

# /config.environment.rb
require 'route_extension'
ActionController::Routing::Route.send :include, ThongKuah::Routing::RouteExtensions

#match only paths starting with a
map.connect '/location/:name', :controller => :locations, :path => /^a/   
#match all paths not starting with z
map.connect '/location/:name', :controller => :locations, :not_path => /^z/ 
#combine path and not_path!
map.connect '/location/:name', :controller => :locations, :path => /^a/, :not_path => /^ab/  
map.country ':country', :controller => :locations, :action => :show,
  :conditions => {:path => Regexp.new(Country.all.map(&:name).join('|'))}
map.region ':country/:region', :controller => :locations, :action => :show,
  :conditions => {:path => Regexp.new(Country.all.each{|c| "^#{c.name}" }.join('|')) }