title: Regex: Find all tags whose words begin with capital letters
body: <p>I have this 3 cases.</p>
  
  <pre><code>&lt;title&gt;Continuity Between "kNOWING" AND 'fEELING'&lt;/title&gt;
  &lt;title&gt;Baby's lettter&lt;/title&gt;
  &lt;title&gt;Baby's Letter&lt;/title&gt;
  </code></pre>
  
  <p>I want a regex to match only the 3 tag, because all words starts with capital letters.</p>