Right you are ;)

use warnings;
use strict;
use Benchmark qw(cmpthese);

my $str = "Just Another Perl Hacker";

print join " ", do_substr (), "\n";
print join " ", do_regex (), "\n";
print join " ", do_unpack (), "\n";
print "\n";

cmpthese (-1,
        {
        unpack => \&do_unpack,
        substr => \&do_substr,
        regex => \&do_regex,
        }
    );


sub do_substr {
    my @parts;
   
    push @parts, substr $str, $_, 3 for 0 .. length ($str) - 3;
    return @parts;
}


sub do_regex {
    my @parts = $str =~ /(?=(...))/g;
    return @parts;
}

sub do_unpack {
    my $matches = length ($str) - 2;
    my $temp = "a3XX"  x $matches;
    my @parts = unpack ($temp, $str);
    return @parts;
}
[download]

Prints:

Jus ust st  t A  An Ano not oth the her er  r P  Pe Per erl rl  l H  H
+a Hac ack cke ker 
Jus ust st  t A  An Ano not oth the her er  r P  Pe Per erl rl  l H  H
+a Hac ack cke ker 
Jus ust st  t A  An Ano not oth the her er  r P  Pe Per erl rl  l H  H
+a Hac ack cke ker 

          Rate  regex unpack substr
regex  42045/s     --   -12%   -39%
unpack 47764/s    14%     --   -31%
substr 69161/s    64%    45%     --
[download]

Update: added unpack

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