title: Ruby, Rails - how to check if a var is an Email
body: <p>Does Rails 3 or Ruby have a built in way to return true or false on if a var is an EMAIL ADDRESS?</p>
  
  <p>example</p>
  
  <pre><code>1 returns false
  dadadad@asdasd.net returns true
  blah+asdasds@asdasd.net returns true
  asdasdasdads returns false
  </code></pre>
  
  <p>Maybe something like, if 1.is_a? Email end</p>
  
  <p>thanks</p>