Hello harangzsolt33,

Since the value of $^O can’t change at runtime, SEPARATOR should be evaluated at compile time. Also, why use index and uc and a comparison, when a simple regex will do?

use strict;
use warnings;

use constant SEPARATOR => $^O =~ /MACOS/i ? ':'  :
                          $^O =~ /WIN/i   ? '\\' : '/';

print 'SEPARATOR is "' .  SEPARATOR . "\"\n";
[download]

Hope that helps,