title: How to recognize a string escaping?
body: <p>I have this kind of string :</p>
  
  <pre><code>I\x26#39;m happy
  </code></pre>
  
  <p>I was expecting (Obviously, I guess! :) ):</p>
  
  <pre><code>I'm happy
  </code></pre>
  
  <p>How can I know what the <code>\x26#39;</code> is, and how can I decode it?</p>