title: email regex for upper and lowercase - allow for match in validation
body: <p>I need a regex for email that allows uppercase and lowercase and I want to validate with jquery <code>.match()</code>. Right now I have this working for lowercase only. </p>
  
  <pre><code>^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$
  </code></pre>
  
  <p>I'd like one for UC and LC or a combo. Thanks for your help.</p>