[ java ] 자바 정규식, 참고 블로그, 숫자, 전화번호

https://highcode.tistory.com/6

http://blog.daum.net/question0921/419

public static String getMobileNumberFormat(String mobile)
    {
        String regEx = "(\\d{3})(\\d{3,4})(\\d{4})";

        mobile = mobile.replaceAll(regEx, "$1-$2-$3");

        return mobile;
    }