title: Regex: Line does NOT contain a number
body: <p>I've been racking my brain for hours on this and I'm at my wit's end. I'm beginning to think that this isn't possible for a regular expression.</p>
  
  <p>The closest thing I've seen is this post: <a href="https://stackoverflow.com/questions/406230/regular-expression-to-match-string-not-containing-a-word">Regular expression to match a line that doesn&#39;t contain a word?</a>, but the solution doesn't work when I replace "hede" with the number.</p>
  
  <p>I want to select EACH <em>line</em> that DOES NOT contain: <strong>377681</strong> so that I can delete it.</p>
  
  <pre><code>^((?!377681).)*$ 
  </code></pre>
  
  <p>...doesn't work, along with thousands of other examples/tweaks that I've found or done.</p>
  
  <p>Is this possible?</p>