Domain regex shouldn't reject one character name

For example `q.com`

Author: elidickinson

lib/possible_email.rb

@@ -9,7 +9,7 @@
 HTTPI.log = false
 
 EMAIL_REGEX = /^([\w\.%\+\-]+)@([\w\-]+\.)+([\w]{2,})$/i
-DOMAIN_REGEX = /^[^@]([\w\-]+\.)+([\w]{2,})$/
+DOMAIN_REGEX = /^([\w\-]+\.)+([\w]{2,})$/
 NAME_REGEX = /^\b[a-zA-Z]+\b$/
 
 module PossibleEmail