Quote:
Originally Posted by kovidgoyal
The treatment of character ranges depends on the case sensitive setting. This is particularly useful with unicode ranges, since the regex engine supports full unicode case folding. In any case, this is not something in calibre's control, it comes from the regex engine [url]https://pypi.python.org/pypi/regex[/ur]
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I see. Well we are now aware of this so I can compensate for this behavior.