html - Get First Vid From Youtube VB.NET -

im trying first youtube link youtube or google can't work. can please me out?

dim m new regex("<a href=""/watch?v=.*""")
  
dim request2 system.net.httpwebrequest = system.net.httpwebrequest.create("https://www.youtube.com/results?search_query=" + listbox1.selecteditem + " " + listbox2.selecteditem)
      dim responseyoutube system.net.httpwebresponse = request2.getresponse     textbox2.text = (request2.address.tostring)     dim sr system.io.streamreader = new system.io.streamreader(responseyoutube.getresponsestream())     dim rssourcecodey string = sr.readtoend     dim matches matchcollection = m.matches(rssourcecodey)     textbox1.text = rssourcecodey      each itemcode2 match in matches         youtube = itemcode2.value.split("=").getvalue(1)          listbox2.items.add(youtube) 

? special meta char in regex makes previous token optional 1 (not 1 after * or +). need escape ? symbol in-order match literal ? symbol.

dim m new regex("<a href=""/watch[?]v=.*""") 

or

dim m new regex("<a href=""/watch\\?v=.*""")