What characters are allowed in an email address?

Question

I\'m not asking about full email validation.

I just want to know what are allowed characters in user-name and server parts of email address

Answer 1

I created this regex according to RFC guidelines:

^[\\w\\.\\!_\\%#\\$\\&\\'=\\?\\*\\+\\-\\/\\^\\`\\{\\|\\}\\~]+@(?:\\w+\\.(?:\\w+\\-?)*)+$