in reply to Re^3: A regex that only matches at offset that are multiples of a given N?
in thread A regex that only matches at offset that are multiples of a given N?

Ah, you're using /g...

Yes. Sorry about failing to mention that. It was late and I was tired {excuse, excuse, excuse...}

in that case I'd just..

That is essentially what I doing (except with index) in Re: Store larg hashes more efficiently (10e6 md5s in 260MB at 4µs per lookup), because I couldn't work out how to get a regex to do it for me. Hence the question.

I'd rather push the check inside the regex engine if I could; and it seems like it should be a reasonable ask; but it has me totally stumped.

Even johngg's solution is flawed. :(

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