title: Regex to match ALL-CAPS words of a certain length
body: <p>I have a function which fixes capitalization for those naughty users that insist on making everything UPPERCASE!</p>
  
  <p>I want my function to only be called when a string contains <strong>an uppercase word of 3 or more uppercase letters</strong>.</p>
  
  <p>Can this be done with a regex?</p>
  
  <p>examples:
  for example: <code>I = false</code>, <code>DEAL = true</code>, <code>Welcome = false</code></p>