Let me try explaining the overall goal of the program:

1. Read in directory of file names
   
   
   1. Most file names hava a Root number, Revision, Extension of pdf: 12345_-v1.pdf
   2. Most names have an underscore as the seperator between Root Number and Revision: 3873215a_-v1.pdf
   3. Many names have more than 1 underscore used as text seperators: 21586_rework_bore_tool_-v2.pdf
   4. Some names have no underscores in them: 4148-t-2.pdf
2. I need to display only the latest revision of the file, so if the following exist in the directory:
   21586_rework_bore_tool_-v1.pdf
   21586_rework_bore_tool_-v2.pdf
   
   Only display 21586_rework_bore_tool_-v2.pdf
   
3. I am unable to capture all of the combinations listed above...

I appreciate all recommendations...

AJ