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  DB<6> $x = 'helloworldhellohellohihellohiworldhi'

...
hi
h
l

  DB<8> print "$1\n" while $x =~ /(\w{2,})(?=.*\1.*\1)/g
hello
hello
hi

sub repeat_finder_re {
  my $n = shift;
  '(\w{2,})(?=' . ('.*\\1'x($n-1)) . ')'
}