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That regex is short by a few kilobytes [1]!

When I decided to learn more about regular expressions back in 2002-2003 I found a regular expression for RFC822 (with comments removed): http://www.ex-parrot.com/pdw/Mail-RFC822-Address.html

As an exercise, I deconstructed that into the pieces it was built from. Funny times :)

Don't see a timestamp on your link, but i suspect this one is more correct:

I prefer /@/

This is the only sane way.

Until for some reason a user really needs to use a classic UUCP bang-path. Poor help!trapped!in!lost!server ;)