title: Regex for determining if Alphanumeric code is in range
body: <p>I'm working on an ICD10 diagnosis code application. I need to determine if one ICD10 code falls in a certain range. For example:</p>
  
  <p><strong>Code:</strong> 4A1H7EZ</p>
  
  <p><strong>Range:</strong> 4A1H7CZ - 4A1H7HZ</p>
  
  <p>This should return '<strong>True</strong>'. </p>
  
  <p>I've tried converting the alpha characters to numbers (a=0, b=1 etc) but the resulting number conflicts with other ranges/codes. </p>
  
  <p>Regex isn't my strong point, any suggestions would be appreciated.</p>