Try and find a regular expression (Perl style) to match certain strings, while not matching others. Currently there are three game modes, that can be selected and configured from the settings. These generate Tasks, set limits to how many characters may be used, and which solutions are successful an which are not. All game modes are based on the same concept: the Task to solve will be displayed on the screen as soon as possible (near immediately for Random game, longer for REDB game), and then the user has to enter a regular expression to solve the task. As soon as it fits to conditions, it will be automatically submitted, and the next task will generate - no questions asked. The user will be notified in case s?he rises up a level.