title: Regex expression for timestamp with or without leading zero?
body: <p>I'm struggling with Regex.</p>
  
  <p>This is a sample timestamp: <code>00:00:00.00</code> (Hour, Minutes, Second.Decimal). I also want this value to match <code>00:0:0.00</code> Notice that the leasing zero is optional in the center. </p>
  
  <p>I was using this: <code>[1-60]:[1-60]:[1-60].[1-100]</code>, but that requires no leading zero. I would like help with making a SINGLE regex that works for both of the things listed above.</p>
  
  <p>A complete solution would be fantastic, but if you could just point me in the right direction, that would be helpful as well.</p>