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grail's awk solution has an advantage: scalability. Suppose some industrial application dealt with electronic signals instead of English words. The problem might be to identify lines of length 112 with exactly 27 "U"s. The sed solution would be unwieldy but the awk solution would have two numbers change.
I would suggest a different approach (although it is already solved).
You can always [try to] invert the requirement[s], sometimes that can be implemented easier (and you do not need to pipe sed[s] into each other).
I mean something like this:
Readability - and the aforementioned scalability - goes a long way to nailing awk as the solution. Its syntax is becoming accepted elsewhere as well - bpftrace for example. Worse ways to spend your time than becoming proficient in it. Thanks grail for getting me interested years ago.
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