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WS64: thank you very much for that clarification. Now I understand the \1. It is just a variable that takes the value of whatever is in the brackets.
It also makes me understand that I will have to learn more about regex. Just using the expresso app is not enough. However, from the little bit I have read left and right, and understood, there seem to be many versions of regex.
So, which version should I learn?
And is it correct that calibre and sigil use different regex versions?
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