如何将快速查询参数解析为mongodb regex查询？

const express = require('express');
const app = express();
const MongoClient = require('mongodb').MongoClient;

// 连接到MongoDB数据库
MongoClient.connect('mongodb://localhost:27017', (err, client) => {
  if (err) throw err;
  console.log('Connected to MongoDB');

  const db = client.db('mydb');
  const collection = db.collection('mycollection');

  // 定义路由处理程序
  app.get('/search', (req, res) => {
    const queryParam = req.query.q; // 获取查询参数

    // 构建正则表达式
    const regex = new RegExp(queryParam, 'i');

    // 创建查询对象
    const query = { field: { $regex: regex } };

    // 执行查询
    collection.find(query).toArray((err, result) => {
      if (err) throw err;
      res.json(result);
    });
  });

  // 启动服务器
  app.listen(3000, () => {
    console.log('Server started on port 3000');
  });
});