title: Replace leading zeros in timecode string
body: <p>The host program I am using produces a string timecode as follows: </p>
  
  <pre><code>00:00:01.523
  </code></pre>
  
  <p>How can I replace leading zeros and change it to the following:  </p>
  
  <pre><code>--:--:-1.523
  </code></pre>