diff --git a/src/you_get/extractors/youku.py b/src/you_get/extractors/youku.py
index 09b06a61..c9d98bfd 100644
--- a/src/you_get/extractors/youku.py
+++ b/src/you_get/extractors/youku.py
@@ -55,14 +55,14 @@ class Youku(VideoExtractor):
     def get_vid_from_url(url):
         """Extracts video ID from URL.
         """
-        return match1(url, r'youku\.com/v_show/id_([\w=]+)') or \
-          match1(url, r'player\.youku\.com/player\.php/sid/([\w=]+)/v\.swf') or \
-          match1(url, r'loader\.swf\?VideoIDS=([\w=]+)')
+        return match1(url, r'youku\.com/v_show/id_([a-zA-Z0-9=]+)') or \
+          match1(url, r'player\.youku\.com/player\.php/sid/([a-zA-Z0-9=]+)/v\.swf') or \
+          match1(url, r'loader\.swf\?VideoIDS=([a-zA-Z0-9=]+)')
 
     def get_playlist_id_from_url(url):
         """Extracts playlist ID from URL.
         """
-        return match1(url, r'youku\.com/playlist_show/id_([\w=]+)')
+        return match1(url, r'youku\.com/playlist_show/id_([a-zA-Z0-9=]+)')
 
     def download_playlist_by_url(self, url, **kwargs):
         self.url = url