Thanks for pointing out points in my solution that can be stated cleaner.
This is a bug that was corrected in Perl version 5.18 IIRC. With this correction, lexical variables always work as expected in "(?{ code })" and "(??{ code })" regex constructs.
I wasn't aware of that bug. And your local our $q = $s - 1; fixes that.
it can all be written normally, given that the s/// match regex is, by default, re-compiled on each s/// execution
That is a nice solution! The (??{. . .}) construct wasn't necessary.
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