Java -如何验证不允许的字符？

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

public class CharacterValidation {
    public static void main(String[] args) {
        String input = "Hello@World"; // 要验证的字符串
        String pattern = "[^a-zA-Z0-9]"; // 不允许的字符模式

        Pattern regex = Pattern.compile(pattern);
        Matcher matcher = regex.matcher(input);

        if (matcher.find()) {
            System.out.println("字符串中包含不允许的字符");
        } else {
            System.out.println("字符串中不包含不允许的字符");
        }
    }
}