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my $string = "It's a cat and mouse game.";
$string=join'',map{$_ x rand 3}split//,$string;
...
$string = "It's a cat and mouse game.";
$string=join'',map{$_ x (1 + rand 3)}split//,$string;
print "$string\n";

It'ss a caatt  aannoouuss  gaae
It'''sss aa  cccaaattt   and mmmoussseee gggaaammee...