diff --git a/backbone.js b/backbone.js
index d30b00753..28d1cf7e2 100644
--- a/backbone.js
+++ b/backbone.js
@@ -292,7 +292,7 @@
     // using Backbone's restful methods, override this to change the endpoint
     // that will be called.
     url : function() {
-      var base = getValue(this.collection, 'url') || this.urlRoot || urlError();
+      var base = getValue(this.collection, 'url') || getValue(this, 'urlRoot') || urlError();
       if (this.isNew()) return base;
       return base + (base.charAt(base.length - 1) == '/' ? '' : '/') + encodeURIComponent(this.id);
     },
@@ -638,8 +638,8 @@
 
   // Cached regular expressions for matching named param parts and splatted
   // parts of route strings.
-  var namedParam    = /:([\w\d]+)/g;
-  var splatParam    = /\*([\w\d]+)/g;
+  var namedParam    = /:\w+/g;
+  var splatParam    = /\*\w+/g;
   var escapeRegExp  = /[-[\]{}()+?.,\\^$|#\s]/g;
 
   // Set up all inheritable **Backbone.Router** properties and methods.
@@ -687,9 +687,9 @@
     // Convert a route string into a regular expression, suitable for matching
     // against the current location hash.
     _routeToRegExp : function(route) {
-      route = route.replace(escapeRegExp, "\\$&")
-                   .replace(namedParam, "([^\/]*)")
-                   .replace(splatParam, "(.*?)");
+      route = route.replace(escapeRegExp, '\\$&')
+                   .replace(namedParam, '([^\/]*)')
+                   .replace(splatParam, '(.*?)');
       return new RegExp('^' + route + '$');
     },
 
@@ -855,7 +855,7 @@
     // a new one to the browser history.
     _updateHash: function(location, fragment, replace) {
       if (replace) {
-        location.replace(location.toString().replace(/(javascript:|#).*$/, "") + "#" + fragment);
+        location.replace(location.toString().replace(/(javascript:|#).*$/, '') + '#' + fragment);
       } else {
         location.hash = fragment;
       }
diff --git a/test/model.js b/test/model.js
index 85c6602ca..0ef49c30b 100644
--- a/test/model.js
+++ b/test/model.js
@@ -87,6 +87,18 @@ $(document).ready(function() {
     equals(model.url(), '/collection/%2B1%2B');
   });
 
+  test("Model: url when using urlRoot as a function to determine urlRoot at runtime", function() {
+    var Model = Backbone.Model.extend({
+      urlRoot: function() { return '/nested/' + this.get('parent_id') + '/collection'}
+      // looks better in coffeescript: urlRoot: => "/nested/#{@get('parent_id')}/collection"
+    });	
+
+    var model = new Model({parent_id: 1});
+    equals(model.url(), '/nested/1/collection');
+    model.set({id: 2});
+    equals(model.url(), '/nested/1/collection/2');
+  });
+
   test("Model: clone", function() {
     attrs = { 'foo': 1, 'bar': 2, 'baz': 3};
     a = new Backbone.Model(attrs);
diff --git a/test/test.html b/test/test.html
index 7dda5b331..743292c1d 100644
--- a/test/test.html
+++ b/test/test.html
@@ -6,6 +6,9 @@
   <script type="text/javascript" src="vendor/json2.js"></script>
   <script type="text/javascript" src="vendor/jquery-1.6.4.js"></script>
   <script type="text/javascript" src="vendor/qunit.js"></script>
+  <script type="text/javascript">
+    QUnit.config.reorder = false;
+  </script>
   <script type="text/javascript" src="vendor/jslitmus.js"></script>
   <script type="text/javascript" src="vendor/underscore-1.2.2.js"></script>
   <script type="text/javascript" src="../backbone.js"></script>