class RubyEmail::Rfc5322

an Email Address follows the Rfc5322: http://www.ietf.org/rfc/rfc5322.txt
a Domain Name follows the Rfc1123: https://tools.ietf.org/html/rfc1123
The Rfc5322 designate an email with the format local@domain, where

 - local is a string of US-ASCII characters, without some symboles.

- domain is a valid Domain Name

Constants

ATEXT

one valid character for local part (do not take escaped because the Rfc prefere to avoid them)

ATOM

a valid string for local part

DOT_ATOM_TEXT

a valid string with subdomains, separated by dots for local part

REGEXP

regexp to validate complete email

VALIDE

email grammar