如何查询node.js路由中的同类(正则表达式)的mongodb？

const express = require('express');
const router = express.Router();
const mongodb = require('mongodb');

// 创建MongoDB连接
const MongoClient = mongodb.MongoClient;
const url = 'mongodb://localhost:27017'; // MongoDB连接URL
const dbName = 'mydb'; // 数据库名称

// 路由处理程序
router.get('/search/:keyword', (req, res) => {
  const keyword = req.params.keyword;
  const regex = new RegExp(keyword, 'i'); // 创建不区分大小写的正则表达式

  // 连接MongoDB并查询数据
  MongoClient.connect(url, (err, client) => {
    if (err) {
      console.error('Failed to connect to MongoDB:', err);
      res.status(500).send('Failed to connect to MongoDB');
      return;
    }

    const db = client.db(dbName);
    const collection = db.collection('documents');

    collection.find({ name: regex }).toArray((err, docs) => {
      if (err) {
        console.error('Failed to query MongoDB:', err);
        res.status(500).send('Failed to query MongoDB');
        return;
      }

      res.json(docs);
    });

    client.close();
  });
});

module.exports = router;