ip 及url的正则

        //1.[0-9]只有一位，可以是任意
        //2.1[0-9]{1,2} 1开头，后无论两位还是三位都任意数字
        //3.2[0-4][0-9] 2开头，第二位是0-4第三位任意数字
        //4.25[0-5] 25开头，第三位不能大于5
        String ipRex = "([0-9]|1[0-9]{1,2}|2[0-4][0-9]|25[0-5])";
        String ipM = ipRex+"."+ipRex+"."+ipRex+"."+ipRex;
        String ip1 = "00.0.0.0";//false
        String ip2 = "1111.0.0.0";//false
        String ip3 = "256.0.0.0";//false
        String ip = "255.255.255.255";//false

        String urlM = "http://"+ipM+"[:]\\d+";
        String url = "http://01.0.0.0:8080";
        System.out.println(ip.matches(ipM));
        System.out.println(url.matches(urlM));