ActionController caching small String#split optimization

actionpack/lib/action_controller/caching/actions.rb

@@ -170,14 +170,14 @@ def initialize(controller, options = {}, infer_extension = true)
             options.reverse_merge!(:format => @extension) if options.is_a?(Hash)
           end
 
-          path = controller.url_for(options).split(%r{://}).last
+          path = controller.url_for(options).split('://', 2).last
           @path = normalize!(path)
         end
 
       private
         def normalize!(path)
           path << 'index' if path[-1] == ?/
-          path << ".#{extension}" if extension and !path.split('?').first.ends_with?(".#{extension}")
+          path << ".#{extension}" if extension and !path.split('?', 2).first.ends_with?(".#{extension}")
           URI.parser.unescape(path)
         end
       end