Your regex rejects:

"Randal L. Schwartz"@vms-relay.stonehenge.comm
[download]

And if that was my legitmate email address because of the way my internal company mailing system was set up, you've now given me no opportunity to use your web site. You made two common mistakes in your regex:

• \w doesn't match hyphen, and yet hyphen can easily appear in a domain name.
• Legitimate email addresses might have embedded spaces.

The proper answer here is to not make things up and use the FAQ answers. Don't just invent your own thing.