This worked. Thanks! You're a legend!

Thanks for that. I guess I should've mentioned that I'm using linux. Output of filebot -script fn:sysinfo

FileBot 4.7.7 (r4678)
JNA Native: 4.0.1
MediaInfo: 0.7.88
7-Zip-JBinding: 9.20
Chromaprint: 1.1.0
Extended Attributes: OK
Unicode Filesystem: OK
Script Bundle: 2017-02-10 (r480)
Groovy: 2.4.7 ...

I recently downloaded ten seasons of a series, the episodes were numbered according to their overall number in the series and not by season #/ episode #. The folder looks like this:

001 - AD - Pilot.mp4
002 - AD - Threat Levels.mp4
003 - AD - Stan Knows Best.mp4
004 - AD - Francine's Flashback.mp4 ...