Java校验IP的正则表达式

Java校验IP的正则表达式:
String ip = "^(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|[1-9])\\."  
                +"(00?\\d|1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)\\."  
                +"(00?\\d|1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)\\."  
                +"(00?\\d|1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)$";
Pattern pattern = Pattern.compile(ip);  
        Matcher matcher = pattern.matcher("192.168.2.22");
        System.out.println(matcher.matches());