title: Pad left with zeroes
body: <p>I want to pad left every number with zeroes (it has to be 8 digits) in my string.</p>
  
  <p>e.g.</p>
  
  <pre><code>asd 123 rete &gt; asd 00000123 rete
  4444 my text &gt; 00004444 my text
  </code></pre>
  
  <p>Is it possible to do this using regular expressions? Especially <code>Regex.Replace()</code>?</p>
  
  <p>Notice that the number of zeroes is different for different numbers. I mean the padded number has to be 8 digits long.</p>