-            youtube_url = self._html_search_regex(
-                r'<iframe.* src="((?:https?:)?//(?:[^.]+\.)?youtube\.com/.+?)"',
-                webpage, 'fallback video URL', default=None)
-            if youtube_url is not None:
-                return self.url_result(youtube_url, ie='Youtube')
+            youtube_url = YoutubeIE._extract_url(webpage)
+            if youtube_url:
+                return self.url_result(youtube_url, ie=YoutubeIE.ie_key())