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1). There is no central repository of regex expressions although there are lots of threads in the forum discussing possibilities for different scenarios.
2). No, not without changing Calibre
3). You could in theory create a Calibre database containing just book entries using the command line tools without copying the actual files. However Calibre would then not know about your files which probably defeats the object of cataloging them.
4). The Folder structure is not amenable to change without a significant re-write of Calibre. You should treat the Calibre folders as a "Black Box" and only access the books in them via the Calibre GUI. Calibre expects all categorisation to be done by the use of tags, not by the folder structure (which is always subject to change without notice although in practise it is unlikely to happen).
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