전화번호 정규식 함수

[자바]
public String phoneConvert(String phoneNumber){
String regEx = "(\d{3})(\d{3,4})(\d{4})"; // ex)070-716-0717
String regEx2 = "(\d{4})(\d{4})"; // ex)1688-8000
String regEx3 = "(\d{3})(\d{3,4})(\d{4,6})"; // ex)070-716-0717~8
return phoneNumber.replaceAll(regEx, "$1-$2-$3").replaceAll(regEx2, "$1-$2").replaceAll(regEx3, "$1-$2-$3");
}

[자바스크립트]
function phoneConvert(phoneNumber){
phoneNumber = phoneNumber.split("-").join("");
return phoneNumber.replace(/^(\d{2,3})(\d{3,4})(\d{4})$/, '$1-$2-$3');
}