Return returning only number by javascrip with regex

formatted-number-field.js

// function typing always return number with regex
function formattedNumberField (selector = ".formattedNumberField") {
    $(selector).on('keyup', function() {
        /**
         * Regular Expression.
         *  ref.
         *    https://regex101.com
         *    
         * @type {RegExp}
         */
        var regex = /^0+/gi; // Find leading zero
        var rgex  = /\D/g;   // Digits
        var regx  = /\B(?=(\d{3})+(?!\d)\.?)/g; // Formating number

        // skip for arrow keys
        if(event.which >= 37 && event.which <= 40) return;

        // disable leading 0
        if (this.value.match(regex)) this.value = this.value.replace(regex, '');

        // format number
        $(this).val(function(index, value) {
            return value.replace(rgex,"").replace(regx, ",");
        });

    });
}