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					Originally Posted by Tattvadarzin  I edited my post to add ^\\(?!Library$) which employs negative lookahead, but you may not have seen that.
 Things look better but I see 3 png files in My Books: kfmon, koreader and plato.  I will need to redo the above as I am not sure which regex I used.
 
 I don't understand why I need the reinstall unless Kobo physically removes files on the rescan.
 
 Anyway thanks for the help.  I like to understand what is going on under the hood.
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 Kobo treats those now excluded files as being removed from the device so to keep things consistent, they remove the files.
As for those 3 files, I suspect they are the icons used by KFMon to launch the programs.  I use NickelMenu to launch so I deleted those files.
I tend to be the same why which is why I have a Clara HD to experiment with and a Forma to read on.  If I'm going to experiment, a device such as the Clara HD with it's removable internal μSD card is essential if I don't want to indulge in brick production.
Edit: the KOReader and KFMon icons should be in the root of your Kobo's exposed storage while the Plato icon is in the icons folder in the root of the storage.