use a parser to extract the group parts from the path

actionpack/lib/action_dispatch/journey/nodes/node.rb

@@ -93,6 +93,10 @@ module ActionDispatch
 
       class Star < Unary # :nodoc:
         def type; :STAR; end
+
+        def name
+          left.name.tr '*:', ''
+        end
       end
 
       class Binary < Node # :nodoc:

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -108,12 +108,12 @@ module ActionDispatch
           end
 
           def normalize_options!(options, path_params)
-            path_without_format = path.sub(/\(\.:format\)$/, '')
+            wildcards = path_ast(path).grep(Journey::Nodes::Star).map(&:name)
 
             # Add a constraint for wildcard route to make it non-greedy and match the
             # optional format part of the route by default
-            if path_without_format.match(WILDCARD_PATH) && options[:format] != false
-              options[$1.to_sym] ||= /.+?/
+            if wildcards.any? && options[:format] != false
+              wildcards.each { |wc| options[wc.to_sym] ||= /.+?/ }
             end
 
             if path_params.include?(:controller)

actionpack/test/dispatch/mapper_test.rb

@@ -72,7 +72,7 @@ module ActionDispatch
         mapper = Mapper.new fakeset
         mapper.get '/*path/foo/:bar', :to => 'pages#show'
         assert_equal '/*path/foo/:bar(.:format)', fakeset.conditions.first[:path_info]
-        assert_nil fakeset.requirements.first[:path]
+        assert_equal(/.+?/, fakeset.requirements.first[:path])
       end
 
       def test_map_wildcard_with_multiple_wildcard
@@ -80,7 +80,7 @@ module ActionDispatch
         mapper = Mapper.new fakeset
         mapper.get '/*foo/*bar', :to => 'pages#show'
         assert_equal '/*foo/*bar(.:format)', fakeset.conditions.first[:path_info]
-        assert_nil fakeset.requirements.first[:foo]
+        assert_equal(/.+?/, fakeset.requirements.first[:foo])
         assert_equal(/.+?/, fakeset.requirements.first[:bar])
       end