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1. In the "Edit metadata in bulk" window, tab "search and replace", search mode "Regular expression", edit "Search for", does not recognize the "\s" symbol as a generic space, while in regex searches in the calibre editor the "\s" symbol is recognized as expected.
2. If the "Case sensitive" checkbox IS selected, the search does NOT take place respecting upper/lower case; if it is not selected, the search takes place respecting upper/lower case.