Regex for IP v4 Address : Pattern Match « Regular Expressions « Java Tutorial

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 * $Date: 2008-04-27 22:23:31 +0100 (Sun, 27 Apr 2008) $
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import java.util.regex.Pattern;

 * A collection of utilities relating to InetAddresses.
public class InetAddressUtils {

    private InetAddressUtils() {
    private static final Pattern IPV4_PATTERN = 

    private static final Pattern IPV6_STD_PATTERN = 

    private static final Pattern IPV6_HEX_COMPRESSED_PATTERN = 

    public static boolean isIPv4Address(final String input) {
        return IPV4_PATTERN.matcher(input).matches();

    public static boolean isIPv6StdAddress(final String input) {
        return IPV6_STD_PATTERN.matcher(input).matches();
    public static boolean isIPv6HexCompressedAddress(final String input) {
        return IPV6_HEX_COMPRESSED_PATTERN.matcher(input).matches();
    public static boolean isIPv6Address(final String input) {
        return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input); 


8.6.Pattern Match
8.6.1.Pattern.matches method
8.6.2.Find the end point of the second 'B(ond)'
8.6.3.Match Duplicate Words
8.6.4.Validate email address
8.6.5.Matching Line Boundaries in a Regular Expression
8.6.6.Regex for IP v4 Address
8.6.7.Regex for IP v6 Address