This will not match addresses with non latin characters.

Yep, shouldn't the right answer be: accept whatever the user gave you, validate it with a link in the email you send that they've received it.

Should be even more important if you ever intend to do business with say someone from China. Good luck dealing with validating hanji in an email.

Addresses do not have non Latin characters.

Which is false:

http://tools.ietf.org/html/rfc6530

http://tools.ietf.org/html/rfc6531

http://tools.ietf.org/html/rfc6532

http://tools.ietf.org/html/rfc6533

Relying on standards that new for something like email would be a mistake IMO. Ymmv.

You are missing a * just before the $.