Slightly off topic, but even with access to the RFC you weren't likely to get that one right. Validating any email address correctly with a regex is nearly imp

Slightly off topic, but even with access to the RFC you weren't likely to get that one right. Validating any email address correctly with a regex is nearly impossible (a canonical example of the horror: http://ex-parrot.com/~pdw/Mail-RFC822-Address.html http://ex-parrot.com/~pdw/Mail-RFC822-Address.html and even that one has a limitation or 2). I think the only correct answer to that question is to suggest an alternative to a regular expression. It could be that was the answer they were looking for.