title: Regex to check a word is present in line exactly three times
body: <p>I'm trying to create a Regex. I have 4 <code>Yes/No</code> questions and I'm storing the answers in a text field, like <code>YesYesNoNo</code> or <code>YesNoNoYes</code> etc.</p>
  <p>I want my Regex to check if the answer line contains exactly <strong>3</strong> <code>Yes</code>.</p>
  <p>I have tried</p>
  <pre><code>Yes{3}, [r'(Yes)\W+']
  </code></pre>
  <p>and some other silly options.</p>