Finding all regex matches by index?

I have a long string (possibly 100s of Mbytes) that I want to search for
regex matches. re.finditer() is *almost* what I want, but the problem
is that it returns matching strings. What I need is a list of offsets
in the string where the regex matched. Thus:

s = "this is a string"
find("is", s) => [2, 5]

Is there anything that does this?
.

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