title: Reg Exp for URL that could be encoded
body: <p>I have a url schema like that: <em>/users/orders/{orderId}</em>.
  The <em>orderId</em> can contains letters, digits or is maybe url encoded.
  e.g.:</p>
  
  <ul>
  <li>/users/orders/123</li>
  <li>/users/orders/ads </li>
  <li>/users/orders/13as </li>
  <li>/users/orders/34sl%3F</li>
  </ul>
  
  <p>What I need is a Reg Exp that match the url schema.<br>
  I started with <code>^/users/orders/[a-zA-Z0-9]+$</code>.<br>
  But I am missing something like or <code>%A-Z0-9</code> at the end.</p>
  
  <p>Thanks</p>