I have seen many examples, with many ‘no, you missed something’ comments. What is the right way to match an e-mail address?
For Sanity sake, only fully-qualified domain names, no @localhost allowed. (or, both ways)
Subdomains must be allowed (issac@deptartment.company.museum)
This regular expression complies with the grammar described in RFC 2822, it’s very long, but the grammar described in the RFC is complex…