是否可以编写正则表达式来提取java包？

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

public class PackageExtractor {
    public static void main(String[] args) {
        String input = "package com.example.myapp;";
        String pattern = "package\\s+([a-zA-Z0-9.]+);";

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

        if (matcher.find()) {
            String packageName = matcher.group(1);
            System.out.println("提取到的包名为: " + packageName);
        } else {
            System.out.println("未找到匹配的包名");
        }
    }
}