title: Regular expression for time period
body: <p>I am using jdev 12.2.1.0.0 and I am trying to validated an input field(String) with the ""
  in which i am try to enter period of time in  formats shown below</p>
  
  <ul>
  <li>1h 40m 20s </li>
  <li>1h 40m</li>
  <li>2h 30s</li>
  <li>30m 20s</li>
  <li>30m  </li>
  <li>30 (It will be considered as 30m)</li>
  <li>10s</li>
  </ul>
  
  <p>So I need a regular expression which allow a user to enter the period of time in any given format also no need to consider the space between the unit (ie: 1h30m is also valid).</p>