title: What's the best way to split the letter and number sections from a string?
body: <p>Say I have a string <code>"AB12"</code>, what's the best (least cumbersome) way to grab the two parts <code>"AB"</code> and <code>"12"</code>.</p>
  
  <p>Other valid strings to split could be <code>"A1"</code>, <code>"AA1"</code>, <code>"A12"</code>. This is for a JavaScript spreadsheet application, hence the strings always relate to spreadsheet ranges.</p>