title: Add character in a link
body: <p>I want to add an character to a link.
  The link is <code>C:\Users\user\Documents\test.csv</code> I want to add <code>C:\Users\user\Documents\test_new.csv</code>.
  So you can see I added the <strong>_new</strong> to the filename.</p>
  <p>Should I extract the name with <code>Path(path).name)</code> and then with Regex? What is the best option for do that?</p>