docs: function (fromString) {
                      var matches = fromString.match(/(\${.*?})/g);
                      if (matches != null) {
                          for (var i = 0; i < matches.length; i++) {
                              var val = values[matches[i].substring(2, matches[i].length - 1)] || "";
                              if (val != null) {
                                  fromString = fromString.replace(matches[i], val);
                              }
                          }
                      }
                      return fromString;
                  }