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Postings from August 2010
A slightly simpler case:
$ perl -le '$_="CCCGGG"; s!.!@a{print("[$&]"),/./}!g'
[C]
[C]
[C]
[C]
[C]
[C]
What’s happening is that the s/// does not reset PL_curpm for each iteration, because it doesn’t usually have to.
The RHS’s scoping takes care of it most of the time. This happens with the /e modifier and with @{...}.
In this example, though, we have a subscript, not a block. This subscript is in the same scope as the s/// itself.
The assumption that the substitution operator will never have to reset PL_curpm itself appears to be incorrect. The attached patch fixes it.
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