title: Find and replace a character to create a new cell
body: <p>For example if have </p>
  
  <p><code>" size:1, color:red CH 4"</code></p>
  
  <p>in one cell, I want  </p>
  
  <p><code>" size:1. color:red" new cell "4"</code></p>
  
  <p>Basically, find "CH" and replace it with a new cell and everything in front of it.
  Anyone know how?</p>