title: Regex for product key
body: <p>I am trying to do a regex that will show all product keys with the value <code>#####-#####-#####-#####-#####</code></p>
  
  <p>this is the regular expression i have created</p>
  
  <pre><code>[A-Z0-9]{5}-[A-Z0-9]{5}-[A-Z0-9]{5}-[A-Z0-9]{5}-[A-Z0-9]{5}
  </code></pre>
  
  <p>for some reason it just isn't working.</p>