Email validation using regex

I believe using regular expression is a very bad idea for validating an email address. The main issue seems to stem from the fact that regex is primitive tool to validate the complexity in email grammar, as specified in RFC 5322. Recently I tried registering for an account at the RTA mobile site at, all went fine except for the fact that my valid email account which I have been using since 2006 is not recognized as a valid one. [Read More]