sub range_to_list {
    my( $max, $range ) = @_;
    my( $lo, $sep, $hi ) = $range =~ m[^(\d+)?(?:(-)(\d*))?$] or die "Invalid range:$range\n";
    $lo ||= 0; 
    $hi ||= $sep ? $max : $lo;
    $_ > $max and die "$_ out of range\n" for $lo, $hi;
    return $lo .. $hi;
}

##</code><code>##

C:\test>junk61
maxind=10

rstr:x:...exc:Invalid range:x

rstr:1-2-3:...exc:Invalid range:1-2-3

rstr:0:...ret:0:
rstr:10:...ret:10:
rstr:11:...exc:11 out of range

rstr:4:...ret:4:
rstr:4-6:...ret:4 5 6:
rstr:7-:...ret:7 8 9 10:
rstr:-2:...ret:0 1 2:
rstr:-10:...ret:0 1 2 3 4 5 6 7 8 9 10:
rstr:-11:...exc:11 out of range

rstr:-0:...ret:0 1 2 3 4 5 6 7 8 9 10:
rstr:10-:...ret:10:
rstr:11-:...exc:11 out of range

apples :one::two::three: