[Thom*]

Originally Posted by kovidgoyal

And that way exists, it is called plugins. http://manual.calibre-ebook.com/crea...t-book-plugins

A regex function operates on matched text, in the context of a single file at a time, it does not make sense to do arbitrary processing from within it.

Learning how to create a plugin might strain my mental capacity, but thanks for the explanation. I have been wondering about this for some time.