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  1. or download this
    $x?$y=1:$y=~s/.*/0/;
  2. or download this
      my $y = 1;
  $y = 0 if (!$x);
  3. or download this
      my $y = "a big string of something";
  if (!$x) {
    $y =~ s/somebigoldregex/etc/;
  }