如何检查youtube url在laravel中是否存在？

Route::get('/check-youtube-url', 'YoutubeController@checkUrl');

php artisan make:controller YoutubeController

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class YoutubeController extends Controller
{
    public function checkUrl(Request $request)
    {
        $url = $request->input('url');

        // 使用正则表达式检查URL是否符合YouTube的格式
        $pattern = '/^(https?:\/\/)?(www\.)?(youtube\.com|youtu\.be)\/.+/';
        if (preg_match($pattern, $url)) {
            // URL存在
            return response()->json(['exists' => true]);
        } else {
            // URL不存在
            return response()->json(['exists' => false]);
        }
    }
}

<form action="/check-youtube-url" method="GET">
    <input type="text" name="url" placeholder="Enter YouTube URL">
    <button type="submit">Check URL</button>
</form>

<div id="result"></div>

<script>
    // 使用JavaScript发送请求并处理响应
    document.querySelector('form').addEventListener('submit', function(event) {
        event.preventDefault();

        var url = document.querySelector('input[name="url"]').value;

        fetch('/check-youtube-url?url=' + encodeURIComponent(url))
            .then(function(response) {
                return response.json();
            })
            .then(function(data) {
                var result = document.getElementById('result');
                if (data.exists) {
                    result.textContent = 'URL exists';
                } else {
                    result.textContent = 'URL does not exist';
                }
            });
    });
</script>