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c:\@Work\Perl\monks>perl -wMstrict -le
"my $s = 'foobar';
...
"
positive look-behind capture: 'foo'
positive look-ahead capture:  'bar'

c:\@Work\Perl\monks>perl -wMstrict -MData::Dump -le
"my $s = 'abcd efgh';
...
  "overlapping captures: ",
  ["abcd", "bcd", "cd", "d", "efgh", "fgh", "gh", "h"],
)