To get the Youtube VideoId from an Url in C# and VB.NET you can use the following snippet.
It matches these 18 type of Youtube Links (Sample Data):

Sample Input

  • http://youtu.be/AAAAAAAAA01
  • http://www.youtube.com/embed/watch?feature=player_embedded&v=AAAAAAAAA02
  • http://www.youtube.com/embed/watch?v=AAAAAAAAA03
  • http://www.youtube.com/embed/v=AAAAAAAAA04
  • http://www.youtube.com/watch?v=AAAAAAAAA06
  • www.youtube.com/watch?v=AAAAAAAAA07
  • www.youtu.be/AAAAAAAAA08
  • youtu.be/AAAAAAAAA09
  • http://www.youtube.com/watch?feature=player_embedded&v=AAAAAAAAA05
  • http://www.youtube.com/watch?v=i-AAAAAAA14&feature=related
  • http://www.youtube.com/attribution_link?u=/watch?v=AAAAAAAAA15&feature=share&a=9QlmP1yvjcllp0h3l0NwuA
  • http://www.youtube.com/attribution_link?a=fF1CWYwxCQ4&u=/watch?v=AAAAAAAAA16&feature=em-uploademail
  • http://www.youtube.com/attribution_link?a=fF1CWYwxCQ4&feature=em-uploademail&u=/watch?v=AAAAAAAAA17
  • http://www.youtube.com/v/A-AAAAAAA18?fs=1&rel=0
  • youtube.com/watch?v=AAAAAAAAA10
  • http://www.youtube.com/watch/AAAAAAAAA11
  • http://www.youtube.com/v/AAAAAAAAA12
  • http://www.youtube.com/v/AAAAAAAAA13
  • Sample C#

    using System.Linq;
    using System.Text.RegularExpressions;
    
    namespace de.fesslersoft.YoutubeRegexTest
    {
        internal static class Youtube
        {
            private const string YoutubeLinkRegex = "(?:.+?)?(?:\\/v\\/|watch\\/|\\?v=|\\&v=|youtu\\.be\\/|\\/v=|^youtu\\.be\\/)([a-zA-Z0-9_-]{11})+";
    
            internal static string GetVideoId(string input)
            {
                var regex = new Regex(YoutubeLinkRegex, RegexOptions.Compiled);
                foreach (Match match in regex.Matches(input))
                {
                    //Console.WriteLine(match);
                    foreach (var groupdata in match.Groups.Cast<Group>().Where(groupdata => !groupdata.ToString().StartsWith("http://") && !groupdata.ToString().StartsWith("https://") && !groupdata.ToString().StartsWith("youtu") && !groupdata.ToString().StartsWith("www.")))
                    {
                        return groupdata.ToString();
                    }
                }
                return string.Empty;
            }
        }
    }
    

    Sample VB.NET

    Imports System.Linq
    Imports System.Text.RegularExpressions
     
    Namespace de.fesslersoft.YoutubeRegexTest
        Friend NotInheritable Class Youtube
            Private Sub New()
            End Sub
            Private Const YoutubeLinkRegex As String = "(?:.+?)?(?:\/v\/|watch\/|\?v=|\&v=|youtu\.be\/|\/v=|^youtu\.be\/)([a-zA-Z0-9_-]{11})+"
     
            Friend Shared Function GetVideoId(input As String) As String
                Dim regex = New Regex(YoutubeLinkRegex, RegexOptions.Compiled)
                For Each match As Match In regex.Matches(input)
                    For Each data As Group In match.Groups.Cast(Of Group)().Where(Function(groupdata) Not groupdata.ToString().StartsWith("http://") AndAlso Not groupdata.ToString().StartsWith("https://") AndAlso Not groupdata.ToString().StartsWith("youtu") AndAlso Not groupdata.ToString().StartsWith("www."))
                        Return data.ToString()
                    Next
                Next
                Return String.Empty
            End Function
        End Class
    End Namespace
    

    Output / Sample

    var urlList = new List<String>
    {
    	"http://youtu.be/AAAAAAAAA01",
    	"http://www.youtube.com/embed/watch?feature=player_embedded&v=AAAAAAAAA02",
    	"http://www.youtube.com/embed/watch?v=AAAAAAAAA03",
    	"http://www.youtube.com/embed/v=AAAAAAAAA04",
    	"http://www.youtube.com/watch?feature=player_embedded&v=AAAAAAAAA05",
    	"http://www.youtube.com/watch?v=AAAAAAAAA06",
    	"www.youtube.com/watch?v=AAAAAAAAA07",
    	"www.youtu.be/AAAAAAAAA08",
    	"youtu.be/AAAAAAAAA09",
    	"youtube.com/watch?v=AAAAAAAAA10",
    	"http://www.youtube.com/watch/AAAAAAAAA11",
    	"http://www.youtube.com/v/AAAAAAAAA12",
    	"http://www.youtube.com/v/AAAAAAAAA13",
    	"http://www.youtube.com/watch?v=i-AAAAAAA14&feature=related",
    	"http://www.youtube.com/attribution_link?u=/watch?v=AAAAAAAAA15&feature=share&a=9QlmP1yvjcllp0h3l0NwuA",
    	"http://www.youtube.com/attribution_link?a=fF1CWYwxCQ4&u=/watch?v=AAAAAAAAA16&feature=em-uploademail",
    	"http://www.youtube.com/attribution_link?a=fF1CWYwxCQ4&feature=em-uploademail&u=/watch?v=AAAAAAAAA17",
    	"http://www.youtube.com/v/A-AAAAAAA18?fs=1&rel=0"
    };
    
    foreach (var entry in urlList)
    {
    	Console.WriteLine(Youtube.GetVideoId(entry));
    }
    Console.Read();
    

    will result in the follwing output:

    Youtube VideoId Regex Console Window Output
    Youtube VideoId Regex Console Window Output

    A simpler but less matching solution can be found here: How to get the VideoID of a youtube video using Regex

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