diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index 26ca2ca818191aa5a8ace354506b84d1fe1889d5..b9e097e5d1cbdb21fb0a18c83dba94ed75e86374 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -774,6 +774,10 @@ def apply_common_behavior_for(method, resources, options, &block)
               return true
             end
 
+            options.each do |k,v|
+              (options[:constraints] ||= {})[k] = options.delete(k) if options[k].is_a?(Regexp)
+            end
+
             scope_options = options.slice!(*RESOURCE_OPTIONS)
             unless scope_options.empty?
               scope(scope_options) do
diff --git a/actionpack/test/dispatch/routing_test.rb b/actionpack/test/dispatch/routing_test.rb
index 8a1bacce159c59ed22c0f8c57a15dfd89ee8a463..fa8447efaecd55276494070bc746dbe2a668c3ec 100644
--- a/actionpack/test/dispatch/routing_test.rb
+++ b/actionpack/test/dispatch/routing_test.rb
@@ -379,6 +379,12 @@ def self.matches?(request)
         end
       end
 
+      namespace :wiki do
+        resources :articles, :id => /[^\/]+/ do
+          resources :comments, :only => [:create, :new]
+        end
+      end
+
       scope :only => :show do
         namespace :only do
           resources :sectors, :only => :index do
@@ -1962,6 +1968,22 @@ def test_greedy_resource_id_regexp_doesnt_match_edit_and_custom_action
     end
   end
 
+  def test_resource_constraints_are_pushed_to_scope
+    with_test_routes do
+      get '/wiki/articles/Ruby_on_Rails_3.0'
+      assert_equal 'wiki/articles#show', @response.body
+      assert_equal '/wiki/articles/Ruby_on_Rails_3.0', wiki_article_path(:id => 'Ruby_on_Rails_3.0')
+
+      get '/wiki/articles/Ruby_on_Rails_3.0/comments/new'
+      assert_equal 'wiki/comments#new', @response.body
+      assert_equal '/wiki/articles/Ruby_on_Rails_3.0/comments/new', new_wiki_article_comment_path(:article_id => 'Ruby_on_Rails_3.0')
+
+      post '/wiki/articles/Ruby_on_Rails_3.0/comments'
+      assert_equal 'wiki/comments#create', @response.body
+      assert_equal '/wiki/articles/Ruby_on_Rails_3.0/comments', wiki_article_comments_path(:article_id => 'Ruby_on_Rails_3.0')
+    end
+  end
+
 private
   def with_test_routes
     yield