#!/usr/bin/perl -l

# http://perlmonks.org/?node_id=1166921

use strict;
use warnings;

my @array = ("1","2","3","5","6","7","9");

my @ranges = "@array" =~
  s/\b(\d+)\K (?=(\d+)(??{$1 != $2 - 1 && 'fail' }))/:/gr =~
  s/:\S+:/:/gr =~
  /\S+/g;

print "@ranges";

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In reply to Re: Generating ranges of numbers by Anonymous Monk
in thread Generating ranges of numbers by nandymamith

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