regex - Ruby email check (RFC 2822)

Question

Does anyone know what the regular expression in Ruby is to verify an email address is in proper RFC 2822 email format?

What I want to do is:

string.match(RFC_2822_REGEX)

where "RFC_2822_REGEX" is the regular expression to verify if my string is in valid RFC 2882 form.

Answer 1

You can use the mail gem to parse any string according to RFC2822 like so:

def valid_email( value )
  begin
   return false if value == ''
   parsed = Mail::Address.new( value )
   return parsed.address == value && parsed.local != parsed.address
  rescue Mail::Field::ParseError
    return false
  end
end

This checks if the email is provided, i.e. returns false for an empty address and also checks that the address contains a domain.