#!/usr/bin/perl -l

# http://perlmonks.org/?node_id=1168288

use strict;
use warnings;

my @ra = qw(0001 0002 0003 011 012 013 015 16 17 18 20);

print join(',', @ra) =~ s/\b(\d+)(?{$1})\K(?:,(\d+)\b(??{++$^R!=$2}))+
+/-$2/gr;

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In reply to Re^3: Convert an array of numbers into a range by Anonymous Monk
in thread Convert an array of numbers into a range by rmocster

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