Turns (148..153) to "148-53".
use 5.6.0;

# XXX BUGGY
# will be fixed shortly
sub num2range {
  local $_ = join ',' => @_;
  s{(\d+?|)(\d+)(?:,\1((??{$++1})))+}{$1$2-$+}g;
  return $_;
}

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In reply to List-to-Range (Advanced) by japhy

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