Only the OP knows exactly what the delimiter rule is — any occurrence of AAA 
and BBB, or as words, or as complete lines …  — so the best way to code the 
delimiters isn’t clear, but aside from that, I agree completely. Using pre- and 
post-assertions to match just the string to be removed is certainly overkill 
for this problem.

Regards,

        Neil Faiman

> On Sep 19, 2021, at 9:31 PM, Tim A <timaaron...@gmail.com> wrote:
> 
> Neil's solution encouraged me to learn about "Pattern Modifiers", e.g. (?imsx)
> And I am able to parse the look around aspects of his solution... but isn't 
> it adequate to just use ...
> Search:    (?s)AAA\n.+?BBB
> Replace:  AAA\nBBB

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