title: Need C# Regex to match a four digit sequence, but ignore any single digits peceeding
body: <p>OK, I need to improve this question. Let me try this again:</p>
  
  <p>I need to parse out a flight time which comes after an airport code, but may have a single digit and white space between the two.</p>
  
  <p>Example data:</p>
  
  <pre><code>ORD  1100
  HOU 1 1215
  MAD   4  1300
  </code></pre>
  
  <p>I tried this:</p>
  
  <pre><code>([A-Z]{3})\s?\d?\s?(\d{4})
  </code></pre>
  
  <p>I end up with the airport code and a single digit.
  I need a regex that will ignore everything after the airport code except the 4 digit flight time.</p>
  
  <p>Hope I improved my question.</p>