Then simply extend the search/replace pattern. Since this is just cosmetics, it is not detrimental if it fails. Here is a complete example. Run this code and it will become clear what is going on:
$c1=$c2=$c3=111222333444555;
$c1=~ s/^(-?\d+)(\d{3})(\d{3})/$1,$2,$3/;
$c2=~ s/^(-?\d+)(\d{3})(\d{3})(\d{3})/$1,$2,$3,$4/;
$c3=~ s/^(-?\d+)(\d{3})(\d{3})(\d{3})(\d{3})/$1,$2,$3,$4,$5/;
print<<END;
$c1
$c2
$c3
END
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