title: Split string on a number, preserving the number
body: <p>I have a string which will always be at least a number, but can also contain letters before and/or after the number:</p>
  
  <pre><code>"4"
  "Section 2"
  "4 Section"
  "Section 5 Aisle"
  </code></pre>
  
  <p>I need to split the string like this:</p>
  
  <pre><code>"4" becomes "4"
  "Section 2" becomes "Section ","2"
  "4 Aisle" becomes "4"," Aisle"
  "Section 5 Aisle" becomes "Section ","5"," Aisle"
  </code></pre>
  
  <p>How can I do this with Ruby 1.9.2?</p>