웅겹살의 프로그래밍 삼매경

public static String phoneMasking(String phoneNo) throws Exception { String regex = "(\\d{2,3})-?(\\d{3,4})-?(\\d{4})$"; Matcher matcher = Pattern.compile(regex).matcher(phoneNo); if(matcher.find()) { String target = matcher.group(2); int length = target.length(); char[] c = new char[length]; Arrays.fill(c, '*'); return phoneNo.replace(target, String.valueOf(c)); } return phoneNo; }