Question

寻找一个传递给String＃matches（String）的字符串，它将匹配IPv4，另一个匹配IPv6。

Answer 1

public static final String IPV4_REGEX = "\\A(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}\\z";
public static final String IPV6_HEX4DECCOMPRESSED_REGEX = "\\A((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?) ::((?:[0-9A-Fa-f]{1,4}:)*)(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}\\z";
public static final String IPV6_6HEX4DEC_REGEX = "\\A((?:[0-9A-Fa-f]{1,4}:){6,6})(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}\\z";
public static final String IPV6_HEXCOMPRESSED_REGEX = "\\A((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)::((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)\\z";
public static final String IPV6_REGEX = "\\A(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}\\z";

从某些博客获得这些内容。有些好的w / regex应该能够为所有IPv6地址类型提供单个正则表达式。实际上，我猜你可以有一个匹配IPv4和IPv6的正则表达式。

Answer 2

处理IP的另一个好方法是使用Java的类Inet4Address和Inet6Address，它们可以通过多种方式使用，其中一种方法是确定IP地址的有效性。 / p>

我知道这不会直接回答这个问题，但只是认为值得一提。

Answer 3

这是匹配IPv4地址的正则表达式：

\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b

在Java中将其指定为字符串文字时，您需要转义反斜杠：

"\\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\b"

Answer 4

package com.capgemini.basics;

import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

public class Main {
    private static Pattern VALID_IPV4_PATTERN = null;
    private static Pattern VALID_IPV6_PATTERN1 = null;
    private static Pattern VALID_IPV6_PATTERN2 = null;
    private static final String ipv4Pattern = "(([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.){3}([01]?\\d\\d?|2[0-4]\\d|25[0-5])";
    private static final String ipv6Pattern1 = "([0-9a-f]{1,4}:){7}([0-9a-f]){1,4}";
    private static final String ipv6Pattern2 = "^((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)::((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)$";


    static {
        try {
            VALID_IPV4_PATTERN = Pattern.compile(ipv4Pattern, Pattern.CASE_INSENSITIVE);
            VALID_IPV6_PATTERN1 = Pattern.compile(ipv6Pattern1, Pattern.CASE_INSENSITIVE);
            VALID_IPV6_PATTERN2 = Pattern.compile(ipv6Pattern2, Pattern.CASE_INSENSITIVE);
        } catch (PatternSyntaxException e) {
            System.out.println("Neither");
        }
    }

    public static List<String> validateAddresses(List<String> ipAddress) {
        final List<String> validity= new ArrayList<String>();
        int len = ipAddress.size();
        for(int i=0; i<len; i++){
            Matcher m1 = Main.VALID_IPV4_PATTERN.matcher(ipAddress.get(i));
            Matcher m12 = Main.VALID_IPV6_PATTERN1.matcher(ipAddress.get(i));
            Matcher m22 = Main.VALID_IPV6_PATTERN2.matcher(ipAddress.get(i));
            if (m1.matches()) {
                validity.add("IPv4");
            }
            else if(m12.matches() || m22.matches()){
                validity.add("IPv6");
            }
            else{
                validity.add("Neither");
            }
        }
        return validity;

    }

    public static void main(String[] args)
    {
        final List<String> IPAddress = new ArrayList<String>();
        //Test Case 0
        /*IPAddress.add("121.18.19.20");
        IPAddress.add("0.12.12.34");
        IPAddress.add("121.234.12.12");
        IPAddress.add("23.45.12.56");
        IPAddress.add("0.1.2.3");*/

        //Test Case 1
        /*IPAddress.add("2001:0db8:0000:0000:0000:ff00:0042:8329");
        IPAddress.add("2001:0db8:0:0:0:ff00:42:8329");
        IPAddress.add("::1");
        IPAddress.add("2001:0db8::ff00:42:8329");
        IPAddress.add("0000:0000:0000:0000:0000:0000:0000:0001");*/

        //Test Case 2
        /*IPAddress.add("000.012.234.23");
        IPAddress.add("666.666.23.23");
        IPAddress.add(".213.123.23.32");
        IPAddress.add("23.45.22.32.");
        IPAddress.add("272:2624:235e:3bc2:c46d:682:5d46:638g");
        IPAddress.add("1:22:333:4444");*/

        final List<String> result = validateAddresses(IPAddress);

        for (int i=0; i<result.size(); i++)
            System.out.println(result.get(i)+" ");

    }

}

Answer 5

正则表达式允许在IPv4部分中使用前导零。

一些Unix和Mac发行版将这些段转换为八进制。

我建议使用25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d作为IPv4段。

Answer 6

当您考虑使用嵌入式ipv4的地址和压缩的地址时，ipv6的正则表达式会变得非常棘手。

The open-source IPAddress Java library将验证IPv6和IPv4的所有标准表示，并且还支持前缀长度（以及此类验证）。免责声明：我是该图书馆的项目经理。

代码示例：

try {
    IPAddressString str = new IPAddressString("::1");
    IPAddress addr = str.toAddress();
} catch(AddressStringException e) {
    //e.getMessage has validation error
}

用于匹配IPv4和IPv6字符串的Java正则表达式是什么？

6 个答案: