Ah, thanks. I got confused because my episode format expression appears to be case insensitive without any flag. I'm guessing this is because I must be using String.match variants there.

I found info about using presets for filtering out paths based on a match here: https://www.filebot.net/forums/viewtopic.php?p=34979 However, this is not working for me where I have a source folder structure like: Series Name --Featurettes ----Season 1 ------video1.mkv ----Season 2 ------video2.mkv ...