If you want to see how that regex was built, buy the MRE book. If you're just making toys to decorate your cubicle walls, fine. But if you're truly setting up a web page for general people to visit from other places, you must permit the RFC-permitted addresses. And the regex for that is the longish thing that Ovid posted. Nothing less.
in reply to Re: Please evaluate: RegEx for validating e-mail addresses
in thread Please evaluate: RegEx for validating e-mail addresses