title: RegEx to replace just part of the match
body: <p>Ive had a look in some similar topics but wasnt able to located what im looking for so im asking a new question.</p>
  
  <p><strong>Is it possible to replace just a part of the string that matches the RegEx?</strong></p>
  
  <p>For instance</p>
  
  <p>I want to replace <code>00NN</code> to <code>+NN</code> . Just doing a simple replace on all <code>00</code> to <code>+</code> is not a option. </p>
  
  <p>Below RegEx locates 2 zeros and 2 following numbers between 1-9.</p>
  
  <pre><code>Dim PhoneNumber AS String = Regex.Replace(IndexString, "([0][0][1-9]{2})", "+")
  </code></pre>
  
  <p>This replaces the entire <code>00NN</code> to <code>+</code>, if is possible to have the replace keep the following <code>NN</code> so it replaces <code>00NN</code> to <code>+NN</code></p>