Format Number As Currency

Format Number As Currency
Add the commas that separate digits in large numbers using this FormatCurrency function for Ruby.
function FormatCurrency(NumToFormat)
        var Formatted;
        Formatted = NumToFormat.replace(/(^|[^\w.])(\d{4,})/g, function($0, $1, $2)
                var Tmp;
                Tmp = $1 + $2.replace(/\d(?=(?:\d\d\d)+(?!\d))/g, "$&,");
                return Tmp;
        return Formatted;

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