Java IP Address Validate isIPv6Address(final String input)

Description

Checks whether the parameter is a valid IPv6 address (including compressed).

License

Open Source License

Parameter

Parameter	Description
input	the address string to check for validity

Return

true if the input parameter is a valid standard or compressed IPv6 address

Declaration

public static boolean isIPv6Address(final String input) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.regex.Pattern;

public class Main {
    private static final Pattern IPV6_STD_PATTERN = Pattern.compile("^[0-9a-fA-F]{1,4}(:[0-9a-fA-F]{1,4}){7}$");
    private static final Pattern IPV6_HEX_COMPRESSED_PATTERN = Pattern
            .compile("^(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)" + // 0-6 hex fields
                    "::" + "(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)$");
    private static final char COLON_CHAR = ':';
    private static final int MAX_COLON_COUNT = 7;

    /**/*from   w w  w  . j  av a  2s .co  m*/
     * Checks whether the parameter is a valid IPv6 address (including compressed).
     *
     * @param input the address string to check for validity
     * @return true if the input parameter is a valid standard or compressed IPv6 address
     */
    public static boolean isIPv6Address(final String input) {
        return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input);
    }

    /**
     * Checks whether the parameter is a valid standard (non-compressed) IPv6 address
     *
     * @param input the address string to check for validity
     * @return true if the input parameter is a valid standard (non-compressed) IPv6 address
     */
    public static boolean isIPv6StdAddress(final String input) {
        return IPV6_STD_PATTERN.matcher(input).matches();
    }

    /**
     * Checks whether the parameter is a valid compressed IPv6 address
     *
     * @param input the address string to check for validity
     * @return true if the input parameter is a valid compressed IPv6 address
     */
    public static boolean isIPv6HexCompressedAddress(final String input) {
        int colonCount = 0;
        for (int i = 0; i < input.length(); i++) {
            if (input.charAt(i) == COLON_CHAR) {
                colonCount++;
            }
        }
        return colonCount <= MAX_COLON_COUNT && IPV6_HEX_COMPRESSED_PATTERN.matcher(input).matches();
    }
}

Related

1. isIpV4StrValid(String str)
2. isIPv6(final String ip)
3. isIPv6(String address)
4. isIpV6Address(CharSequence address)
5. isIPv6Address(final String input)
6. isIPv6Address(String _ipAddress)
7. isIPv6HexCompressedAddress(final String input)
8. isIPv6HexCompressedAddress(final String input)
9. isIPv6HexCompressedAddress(String ip)