title: Extract first N digits from a string
body: <p>I want to extract just FIRST TWO DIGITS from some strings.
  Suppose the data is :</p>
  
  <pre><code>ABC Conference Room Monitor - Z5580J    
  ABC 19 Monitor    
  ABC 24 Monitor for Video-Conferencing
  ABC UltraSharp 24 Monitor -QU2482Z
  </code></pre>
  
  <p>Output desired:</p>
  
  <pre><code>55
  19
  24
  24
  </code></pre>