Hitch
I think you are thinking of the one by Manichean
https://www.mobileread.com/forums/sho...d.php?t=118569
Automa
Others have said it
Sigil uses PCRE REGEX.
This is not some sort of special to Sigil REGEX
Since the tutorial was written, Sigil added saved searches and supplied a 'starter set'.
A
Sigil saved search has 3 parts:
1) A title (so you can find it again

)
2) The Search term
3) the Replace pattern
What they do NOT include is:
(document) Scope
Search mode.

Saved searches do not have to be REGEX searches
direction and wrap status

Read the tutorial, Reverse engineer some of the
starter saved searches to confirm your understanding.
Visit the
Tyrannosaurus Regex thread here at MR for further enlightenment