title: Search and match string, only after a certain point in a file
body: <p>How do I do scan a file after finding a particular line. The first results do not count.
  For example (search for 3s after finding a line that says "begin here"):</p>
  
  <pre><code>Sample file
  1
  3
  3
  4
  begin here
  2
  3
  3
  1
  4
  </code></pre>
  
  <p>The expected output would be two 3s</p>