从链接获取youtube id

using System;
using System.Text.RegularExpressions;

public class Program
{
    public static void Main()
    {
        string youtubeUrl = "https://www.youtube.com/watch?v=dQw4w9WgXcQ";
        string videoId = GetYouTubeVideoId(youtubeUrl);
        Console.WriteLine(videoId);
    }

    public static string GetYouTubeVideoId(string url)
    {
        string videoId = string.Empty;
        string pattern = "(?<=watch\\?v=|/videos/|embed\\/|youtu.be\\/|\\/v\\/|\\/e\\/|watch\\?v=|v=|\\/v\\/|watch\\?v%3D|watch\\?feature=player_embedded&v=|%2Fvideos%2F|embed%\u200C\u200B2F|youtu.be%2F|\\/v%2F)[^#\\&\\?\\n]*";
        Match match = Regex.Match(url, pattern);
        if (match.Success)
        {
            videoId = match.Value;
        }
        return videoId;
    }
}