A widget is incorporated into a user interface associated with a processing system to provide the user with a display of the entered data, together with any added text or other data modifications that result from application of a default format. The display thus enables the user to determine whether or not the default format can be used with the entered data, before the data is processed. The widget also provides a toggle capability, to allow the user to override the default behavior of the processing system and select a different valid format for use with the entered data, from a format priority list contained in the widget. The display and toggle capabilities cause the entered data to be processed by the system as intended by the user.