How to get the list of ipAddresses from the string?

Question

I have a big string with multiple IP addresses in it.

String str1 = "10.0.0.2 - frank [10/Oct/2000:13:55:36" + " -0700] \"GET /apache_pb.gif HTTP/1.0\" 200 2326 "
                + "\"104.244.253.29\" \"Mozilla/4.08 " + "[en] (Win98; I ;104.30.244.2)\"";

I took approach the string into string array using split and later check every word which has 3 . in the word. But dint found to be a fool proof solution.

I want to use a regex and get the List<String> ipAddresses return

public List<String> findIPs(String str) {
 //implement it via regex
}

Here I want 3 item in the list of string which the method will return.

How can I do it via regex?

Thanks in advance.

Answered here https://stackoverflow.com/questions/5667371/validate-ipv4-address-in-java — JineshEP, Jun 16 '18 at 07:24

score 1 · Accepted Answer · answered Jun 16 '18 at 07:17

1

    String str1 = "10.0.0.2 - frank [10/Oct/2000:13:55:36" + " -0700] \"GET /apache_pb.gif HTTP/1.0\" 200 2326 "
                  + "\"104.244.253.29\" \"Mozilla/4.08 " + "[en] (Win98; I ;104.30.244.2)\"";
    Pattern p = Pattern.compile("\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}");
    Matcher m = p.matcher(str1);
    while (m.find()){
        System.out.println(m.group(0));
    }

answered Jun 16 '18 at 07:17

qfrank

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3
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m.group(0) is the matched ip – qfrank Jun 16 '18 at 07:24

How to get the list of ipAddresses from the string?

1 Answers1