当urls具有相同的基础时，如何编写301重定向规则

http://oldsite.com/blog/post1
http://oldsite.com/blog/post2
http://oldsite.com/blog/post3

http://newsite.com/posts/post1
http://newsite.com/posts/post2
http://newsite.com/posts/post3

RewriteEngine On

# 重定向所有/blog/* 到 /posts/*
RewriteRule ^blog/(.*)$ http://newsite.com/posts/$1 [R=301,L]

server {
    listen 80;
    server_name oldsite.com;

    location /blog/ {
        rewrite ^/blog/(.*)$ http://newsite.com/posts/$1 permanent;
    }
}

const express = require('express');
const app = express();

app.use('/blog', (req, res, next) => {
    res.redirect(301, `http://newsite.com/posts${req.originalUrl}`);
});

app.listen(3000, () => {
    console.log('Server is running on port 3000');
});