title: Exclude leading characters within regex group
body: <p>I want to extract a group with a fixed length from a string, but then ignore leading zeroes.</p>
  
  <p>Example:</p>
  
  <pre><code>String: 1a2300245filler060403105543a
              ^^^^^      ^^^^^^
  </code></pre>
  
  <p>Current regex: <code>.{4}(?&lt;part_x&gt;[\d]{5})filler(?&lt;part_y&gt;[\d]{6})</code></p>
  
  <p>This gives me : </p>
  
  <pre><code>part_x = 00245
  
  part_y = 060403
  
  Is there some way to remove the leading zeroes from the grouping to get this?
  
  part_x = 245
  
  part_y = 60403
  </code></pre>
  
  <p>Note that the initial length of part_x and part_y is fixed (5 and 6 respectively). I just want to trim the leading zeroes somehow in the regex.</p>