title: How to check if filename contains substring in JavaScript?
body: <p>I have a folder on the hard drive with files named</p>
  
  <ol>
  <li>myfileone_163637</li>
  <li>myfiletwo_14153535</li>
  <li>myfilethree_3739284</li>
  </ol>
  
  <p>The numbers at the end of the filenames are random.</p>
  
  <p>How can I check with JavaScript if the file containing "myfilethree" in its name is present?</p>
  
  <p>Thank you in advance.</p>