when you have to validate an email address to fit the requirements of some stupid mail software

(^$|^([^<>()\[\].,;:\s@!&#$%+'{}|~*="]+(\.?[^<>()\[\].,;:\s@!&#$%'{}|~*="]+)*))@((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}|(([a-zA-Z\-0-9]+.)+[a-zA-Z]{2,})$)

I'm not even sorry.