title: Extract filename and its extension from a text
body: <p>I have a text file that contain something like this:</p>
  
  <pre><code>Files /dir/AAA.mp3. Files /dir/BBB.mp3 Files /dir/CCC.mp3 Files /dir/{...}.mp3
  </code></pre>
  
  <p>I want to extract file name and its extension to have AAA.mp3, BBB.mp3, ,ccc.mp3 and {...}.mp3.
  I tried to use grep in various ways but it returns whole line.
  pleas help! Thanks.</p>