There's still another "tiny mistake" with your code, which is that the following snippet doesn't generate a string of length 1024001, but a string of length 1: 

my $string  = pack "A*" => map { chr (32 + int rand 95) } 0..1024000;
print length($string);

[download]

Done properly, i.e. either using pack "(A)*", ..., or join '', ..., or the much more memory-friendly 

my $string;
$string .= chr(32 + int rand 95) for 0..1024000;

[download]

I get the following quite different results: 

            Rate subsingle   subplus      tran
subsingle 18.5/s        --      -15%      -93%
subplus   21.9/s       18%        --      -92%
tran       268/s     1345%     1121%        --

[download]

In reply to Re^4: Remove all non alphanumeric characters excluding space, underscore and minus sign (Benchmark--) by Eliya
in thread Remove all non alphanumeric characters excluding space, underscore and minus sign by ikkeniet

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