Java的; 字符串替换(使用正则表达式)？

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

public class Main {
    public static void main(String[] args) {
        String originalString = "Hello, world!";
        String pattern = "world";
        String replacement = "Java";

        // 使用正则表达式替换字符串
        String resultString = originalString.replaceAll(pattern, replacement);

        System.out.println("原始字符串: " + originalString);
        System.out.println("替换后的字符串: " + resultString);
    }
}

原始字符串: Hello, world!
替换后的字符串: Hello, Java!