Search/Replace capabilities of KATE 22.12.3

[Richard Owlett]

My environment is:
   Debian 12.8 with MATE 1.26.0
   KATE identifies itself as version 22.12.3
Documentation I've used:
   https://docs.kde.org/stable5/en/kate/kate/index.html
   https://docs.kde.org/stable5/en/kate/katepart/index.html
   { due to vision/perception issues I avoid PDF }

I am new to Kate, though I've been exposed to a wide variety of editors 
since the 60's (impressed by co-workers use of TECO in the 70's).

I'm reformatting several chapters of a HTML formatted KJV Bible to be a 
pleasant reading experience for visually impaired seniors.

Kate's suitability has been demonstrated by using the GUI to manually 
edit individual chapters. I wish to write macros using ERE's[1] to make 
my project feasible.

I paused a few months ago due to difficulties. A recent WEB search 
turned up a discussion of a similar problem/solution[2].
It referenced Kate 23.04 .

Questions:
   1. Does that discussion apply to Kate 22.12.3?
   2. Is there documentation (preferably a tutorial) for this?
      [I wish to use common terminology when asking further questions.]

TIA

[1] https://www.gnu.org/software/sed/manual/html_node/ERE-syntax.html
[2] 
https://stackoverflow.com/questions/23157001/how-to-replace-kate-regular-expression