title: How to delete outdated files?
body: <p>I have a folder with a couple thousand files. Each file has been updated multiple times, some more than others. Each updated version gets a new number based on the revision. For example, the file "Apple.pdf" has been updated 3 times and now has the name "Apple3.pdf"</p>
  
  <p>Is there any way I can mass delete all files that have updated versions without affecting the files that do not have updated versions? For example, in update 2 I receive 20 files with the name "???2.pdf" and now in update 3 I only have 10 updated files named "???3.pdf". I need to delete the out of date files from update 2, while keeping the ones that were unaffected by update 3.</p>
  
  <p>Thanks in advance for any advice!</p>