ip地址正则表达式java

以下是一个使用正则表达式验证IP地址是否合法的Java程序示例：

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

public class IPAddressValidator {
    private static final String IP_ADDRESS_PATTERN =
            "^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." +
            "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." +
            "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\." +
            "([01]?\\d\\d?|2[0-4]\\d|25[0-5])$";

    public static boolean validateIPAddress(String ipAddress) {
        Pattern pattern = Pattern.compile(IP_ADDRESS_PATTERN);
        Matcher matcher = pattern.matcher(ipAddress);
        return matcher.matches();
    }

    public static void main(String[] args) {
        String ipAddress = "192.168.0.1";
        boolean isValid = validateIPAddress(ipAddress);
        System.out.println("Is IP address valid? " + isValid); // 输出：Is IP address valid? true
    }
}