These numbers look too good to be true: 
$_ = "9876543";
s/(?=..)$/./;
say;
__END__
9876543

[download]
You cannot actual replace a zero-width assertion.

And before benchmarking, you should always check whether you're producing the correct results. Bogus solutions noone cares for, even if they're fast.

In reply to Re^3: Print Number With Implied Decimal Point by JavaFan
in thread Print Number With Implied Decimal Point by j355ga

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