code: function switchRouteMatcher(on, route) {
        var keys = route.keys,
            params = {};
  
        if (!route.regexp) return null;
  
        var m = route.regexp.exec(on);
        if (!m) return null;
  
        for (var i = 1, len = m.length; i < len; ++i) {
          var key = keys[i - 1];
  
          var val = m[i];
  
          if (key && val) {
            params[key.name] = val;
          }
        }
        return params;
      }
docs: /////////////////////////////////////////////////// 
  @param on {string} current url
  @param route {Object} route regexp to match the url against
  @return {?Object}
  
  @description
  Check if the route matches the current url.
  
  Inspired by match in
  visionmedia/express/lib/router/router.js.