yes I know that regex stuff, but it's not relevent as I am using "normal" find & replace in book mode.
my claim is that is is not possible do find . and replace all with whatever. the find + replace all operation on that single punctuation character is crashing sigil
if i were to use your regex, the 2nd bracket should surely be ([A-Z]), and it would not work anyway because of the essential dots in meta headers like
[code]
<html xmlns="http://www.w3.org/1999/xhtml">
[\code]
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