_RSS_URL = 'http://channel9.msdn.com/%s/RSS'
+ @staticmethod
+ def _extract_urls(webpage):
+ return re.findall(
+ r'<iframe[^>]+src=["\'](https?://channel9\.msdn\.com/(?:[^/]+/)+)player\b',
+ webpage)
+
def _extract_list(self, video_id, rss_url=None):
if not rss_url:
rss_url = self._RSS_URL % video_id