Glad we have a common understanding of what the code examples actually do.
I was just looking at the node title: "How to remove everything after last occurrence of a string?". I suspect that is more restrictive than what the OP actually needs (i.e. I suspect that first or last doesn't matter).
As far as \K goes, this to me, in this case, is some "Perl Candy". The same functionality is easily done without it. Many regex implementations do not have this, so in terms of "easy to understand", it flunks unless you are a Perl'er who uses this feature often.
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