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  1. or download this
    my $x = ""; 
    if($x!~//g)  {
    ...
      print "\n There is true data\n";
    
    }
    
  2. or download this
    my $x = "      "; # just spaces
    if($x!~/\s+/g)  {
    ...
      print "\n There is true data\n";
    
    }