title: Verify a string as a valid UUID in Swift
body: <p>Given an supplied <code>String</code>, how can I verify wether the <code>String</code> is a valid UUID in Swift?</p>
  
  <p>A valid UUID (as far as I know) could be:</p>
  
  <pre><code>33041937-05b2-464a-98ad-3910cbe0d09e
  3304193705b2464a98ad3910cbe0d09e
  </code></pre>