#!/usr/bin/ruby
# -*- coding: utf-8 -*-

=begin
이메일 형식 간단 검증
=end

str = "hello@examples.com"

puts str =~ /\A\S+@\S+\.\S+\z/ ? "Valid" : "Invalid"

# ---

puts str.match?(/\A\S+@\S+\.\S+\z/) ? "Valid" : "Invalid"