html - 从Youtube VB.NET获取第一个视频

Question

我试图从youtube或google获取第一个youtube链接，但无法正常工作。有人可以帮我吗？

昏暗的新正则表达式("<a href=""/watch?v=.*""")

Dim request2 As System.Net.HttpWebRequest = System.Net.HttpWebRequest.Create(“https://www.youtube.com/results?search_query=” + ListBox1.SelectedItem +“” + ListBox2.SelectedItem)
Dim responseyoutube As System.Net.HttpWebResponse = request2.GetResponse
TextBox2.Text = (request2.Address.ToString)
Dim sr As System.IO.StreamReader = New System.IO.StreamReader(responseyoutube.GetResponseStream())
Dim rssourcecodey As String = sr.ReadToEnd
Dim matches As MatchCollection = m.Matches(rssourcecodey)
TextBox1.Text = rssourcecodey

For Each itemcode2 As Match In matches
youtube = itemcode2.Value.Split("=").GetValue(1)

ListBox2.Items.Add(youtube)


Answer 1

?是正则表达式中的一种特殊元字符，它使前一个标记成为可选标记(而不是*或+之后的标记)。因此，您需要按顺序转义?符号以匹配文字?符号。

Dim m As New Regex("<a href=""/watch[?]v=.*""")

要么

Dim m As New Regex("<a href=""/watch\\?v=.*""")