jQuery - comma for price function

Question

//comma plugin
$.fn.digits = function(){ 
    return this.each(function(){ 
        $(this).text( $(this).text().replace(/(\d)(?=(\d\d\d)+(?!\d))/g, "$1,") ); 
    })
}

//comma for price on listing and area summary
$('.price-listing, .count-sale').digits();