This Behavior will add country based validation rules to your model. The inspiration for the behavior came from the 1.3-to-do-list that refers to several pending tickets to include more regexes into core's Validation Class. This class already has a few rules with regexes for some countries, although i'm not sure if an endless list with regexes in the Validation class is that desirable. By writing this article i also am completing the missing step of the 12-step-program of Teknoid