Enhancing regex of thousands separator?

Question

I saw this beautiful script to add thousands separator to js numbers:

function thousandSeparator(n, sep)
{
    var sRegExp = new RegExp(\'(-?[0-9]+)([0-9]{3         


        

Answer 1

Try this one:

result = subject.replace(/([0-9]+?)([0-9]{3})(?=.*?\.|$)/mg, "$1,$2");

Test here