title: and not search pattern
body: <p>I created <code>vim</code> search pattern to find bad status codes:</p>
  
  <pre><code>   / [45][0-9][0-9]  
  </code></pre>
  
  <p>It can find <code>504</code> or <code>499</code> or <code>404</code> (space before and after each number)</p>
  
  <p>But I don't want it to find <code>404</code>. How to change my search pattern to make it skip <code>404</code>?</p>