Yes @doitsu, I am trying to learn more about regex functions. I'm not a programmer, so the best I can do is to take what others have done and make small changes that will work for me.
I have an e-book in which the note references are out of sync with the notes page. I used the sequential numbering function from the Calibre manual. But instead of renumbering the note references from the beginning of the book (which would have brought the references into sync) the numbering started with the second file and finished with the first. So, I thought I might find a function that would add a fixed number to all the references from file two through the end and simply renumber the first file by hand. BuiltinAdd sounded like a likely solution.
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