title: Add 10000 to numbers using Regex replace?
body: <p>I need to replace some 2- and 3-digit numbers with the same number plus 10000. So</p>
  
  <pre><code>Photo.123.aspx
  </code></pre>
  
  <p>needs to become</p>
  
  <pre><code>Photo.10123.aspx
  </code></pre>
  
  <p>and also</p>
  
  <pre><code>Photo.12.aspx
  </code></pre>
  
  <p>needs to become</p>
  
  <pre><code>Photo.10012.aspx
  </code></pre>
  
  <p>I know that in .NET I can delegate the replacement to a function and just add 10000 to the number, but I'd rather stick to garden-variety RegEx if I can. Any ideas?</p>