That last bit I said was just an explanation as to why you cannot merely open the book in calibre's Editor to see what needs changing, etc.
You ALWAYS need to use the Regex Builder in calibre in order to find out what to change, or do something else to examine the SOURCE INPUT.
PDF is slightly more complicated because the source input comes from pdftohtml.
But you still need to look at the SOURCE INPUT.
I don't know how many times I need to say this, but calibre's S&R operates on the SOURCE INPUT!
Looking at the converted book in the Editor is worthless, because the book has already been converted and therefore it is no longer the SOURCE INPUT.
Here is a picture, in case it helps....
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