router.rb

module Router
  def self.included(base) # :nodoc:
    base.extend ClassMethods
  end
  
  module ClassMethods
    attr_reader :routes
    
    def map(regex, options = {}, &block)
      define_method "#{regex}", &block
      unbound_method = instance_method("#{regex}")

      block = lambda { unbound_method.bind(self).call }
      
      @routes ||= []
      @routes.push([regex, block]).last
    end
  end

  def route!(email)
    routes = self.class.routes

    routes.each do |regex, block|
      if regex =~ email
        instance_eval(&block)
      end
    end
  end
end

class Foo
  include Router
  
  def foo
    puts "foo!"
  end
end

Foo.map(/.*/) {
  puts "this is the method body and I should be able to call foo"
  foo
}

Foo.new.route!('')