$l .= $_ foreach <DATA>;

while($l =~s/(\w):\s?(\d+)-(\d+)//){
    $h{$1}{$_} = 1 for ($2 .. $3);
}

for $k (sort keys %h){
    print "\n$k: ";
    for (sort {$a <=> $b} keys %{$h{$k}}){
        print "$_ " if $h{$k}{$_-1} == 0;
        print "- $_ " if $h{$k}{$_+1} == 0;
    }
}

__DATA__
a:10-34 b:9-12 c:12-24 e: 1-9
a:1-8 a: 19-24 b:2-6
a:7-11 d:9-23 e: 12-23

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In reply to Re: Union of overlapping numeric intervals by Lennotoecom
in thread Union of overlapping numeric intervals by onlyIDleft

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