diff --git a/lib/routes_upgrader.rb b/lib/routes_upgrader.rb
index a47f024..82dea89 100644
--- a/lib/routes_upgrader.rb
+++ b/lib/routes_upgrader.rb
@@ -185,7 +185,17 @@ module Rails
       end
       
       def opts_to_string(opts)
-        opts.is_a?(Hash) ? opts.to_a.map {|o, v| ":#{o} => '#{v}'"}.join(", ") : nil
+        opts.is_a?(Hash) ? opts.map {|k, v|
+          ":#{k} => " + (v.is_a?(Hash) ? ('{ ' + opts_to_string(v) + ' }') : "#{value_to_string(v)}")
+        }.join(", ") : opts.to_s
+      end
+      
+      def value_to_string(value)
+        case value
+        when Regexp then value.inspect
+        when String then "'" + value.to_s + "'"
+        else value.to_s
+        end
       end
     end
     
diff --git a/test/routes_upgrader_test.rb b/test/routes_upgrader_test.rb
index e9b7ca9..3d2c6a3 100644
--- a/test/routes_upgrader_test.rb
+++ b/test/routes_upgrader_test.rb
@@ -94,6 +94,11 @@ end
     assert_equal "match '/about' => 'static#about', :something => 'extra'", route.to_route_code
   end
   
+  def test_generates_code_for_route_with_requirements
+    route = Rails::Upgrading::FakeRoute.new("/foo", {:controller => 'foo', :action => 'bar', :requirements => {:digit => /%d/}})
+    assert_equal "match '/foo' => 'foo#bar', :constraints => { :digit => /%d/ }", route.to_route_code
+  end
+  
   def test_generates_code_for_root
     routes_code = "
       ActionController::Routing::Routes.draw do |map|