title: Regex to extract whole numbers and ignore number letter combinations
body: <p>I have the following string:</p>
  
  <pre><code>ID: 26bc76f7dbe507f9b5fb232748e52b51 To: 17135917389\n
  </code></pre>
  
  <p>I need to pull out the <code>17135917389</code> and ignore everything else.</p>
  
  <p>How can I ignore the numbers in <code>26bc76f7dbe507f9b5fb232748e52b51</code>?</p>