But I do, I was the first C programmer in my country (Scotland, UK) when we had a PDP 11 running Unix, doing a computing Ph. D. in the late 70s. I first came across regular expressions round then. I am rusty now but I think there is a much simpler regex for my needs so I do need to understand. The example eliminates adobe and kobo directories starting with a dot. For me, who intends to put all his books in \Library, I can future proof any folder name changes by Kobo by excluding any folder not called Library.
Your rant has added no value to the thread. The need arises for future proofing not to mention the principle of simplicity. I am not a techno-illiterate sheep
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I'll try variations on ^\\(?!Library$)