Actually I wrote it as map first and, of course, it didn't work because s// doesn't return the modified string. Breaking the unwritten rule of grep seemed slicker than:

map {s/.../.../ge; $_}
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which still hides side-effects inside map or:

map {(my $x= $_)=~s/.../.../ge; $x}
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which just, well, isn't slick. :)