CodePen Embed - [Javascript] 숫자에 3자리(천단위) 콤마 추가 함수

function addComma(num){
  return num.toString().replace(/\B(?<!\.\d*)(?=(\d{3})+(?!\d))/g, ",");
}

const price = 15000
const price_num = addComma(price)

document.writeln(price_num)

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