java有效的IP正则表达式

public static boolean isboolIp(String ipAddress)  
	{  
		String regex = "^(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|[1-9])\\."
                + "(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)\\."
                + "(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)\\."
                + "(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)$";
		  	return ipAddress.matches(regex);
	}