title: How I can search in vim for non valid characters
body: <p>I've a file with has a invalid character, I want to learn how to search for those kind of characters. Please check image, is what appear after <code>..get Ale</code></p>
  
  <p>I've checked with an heximal editor and the value is</p>
  
  <pre><code>f480 8080 0d 
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/G0oG0.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/G0oG0.png" alt="vim with weird character"></a></p>
  
  <p>I tried with <code>/[^[:alnum:][:punct:][:space:]]</code> with it also returns spaces, dashes etc.</p>