The regex alone is interesting since its count allows to know immediately if the epub is concerned or not. Unless we created them ourselves, we don't necessarily know a lot about our epubs.
It is correct that it is not necessary to use a regex-function to merge note files, this was also written from the #1 message.
This is just a small, unpretentious exercise that first shows a use of 'merge' and 'apply_container_update_to_gui'.
It uses 'replace.call_after_last_match = True' and shows that the content of the 'return' triumphs over changes in the text by this last call when one would expect the opposite. It gives 2 ways to overcome this constraint.
It also shows some data manipulation in the persistent dic 'data'.
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