[Java] 휴대폰 번호 마스킹 코드

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휴대폰 번호를 asterisk(*)로 암호화하는 코드입니다.

	/**
	 * encrypt number in text
	 * 
	 * maskingCallNumber
	 *  
	 * @param str
	 * @return String
	 */
	public static String maskingCallNumber(String str){
		String replaceString = str;
		String matchedStr ="";

		String pattern ="(\\d{2,3})-?(\\d{3,4})-?(\\d{3,4})";
		Matcher matcher = Pattern.compile(pattern).matcher(str);

		if(matcher.find()){
			StringBuffer br = new StringBuffer();
			for(int i = 1 ; i<=matcher.groupCount(); i++){
				matchedStr = matcher.group(i);
				for(int j = 0 ; j <matchedStr.length();j++){
					br.append("*");
				}
				if(i !=matcher.groupCount()){
					br.append("-");
				}
			}
			replaceString =matcher.replaceAll(br.toString());
		}
		return replaceString;
	}