title: Remove all occurrences except last?
body: <p>I want to remove all occurrences of substring = <code>.</code> in a string except the last one.</p>
  
  <p>E.G:</p>
  
  <pre><code>1.2.3.4
  </code></pre>
  
  <p>should become:</p>
  
  <pre><code>123.4
  </code></pre>