Thanks for the link, everything requested is attached.
I created a sample from the actual PDF and now the "Introduction" expression is working, but there is a second one still not working. That expression is:
"<a id="p[0-9]+"></a>[0-9]+<br> T h e G r e a t G a m b l e<br>"
So both examples can be used to detect the problem.
Options different from default are:
Heuristic processing enabled.
In page setup, Kindle is selected.
In PDF Input, no image is selected.
Thanks.