How to add commas to a number?

[JerryP]

Hi!

I am trying to get this to work, but I am not having any luck?

use strict;
use warnings;

sub commify {
    local($_) = shift;
    1 while s/^(-?\d+)(\d{3})/$1,$2/;
    return $_;
}

If I input these numbers:

6238.12
121150.98
104903.30
113569.26
40239.51
 8733.55

I get :

6238.12
121150.98
104903.30
113569.26
40,239.51
 8,733.55

Any ideas?

Thanks

Jerry


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