diff --git a/youtube_dl/extractor/once.py b/youtube_dl/extractor/once.py
index 5db949b17..1bf96ea56 100644
--- a/youtube_dl/extractor/once.py
+++ b/youtube_dl/extractor/once.py
@@ -7,7 +7,7 @@ from .common import InfoExtractor
 
 
 class OnceIE(InfoExtractor):
-    _VALID_URL = r'https?://once\.unicornmedia\.com/now/[^/]+/[^/]+/(?P<domain_id>[^/]+)/(?P<application_id>[^/]+)/(?:[^/]+/)?(?P<media_item_id>[^/]+)/content\.(?:once|m3u8|mp4)'
+    _VALID_URL = r'https?://.+?\.unicornmedia\.com/now/[^/]+/[^/]+/(?P<domain_id>[^/]+)/(?P<application_id>[^/]+)/(?:[^/]+/)?(?P<media_item_id>[^/]+)/content\.(?:once|m3u8|mp4)'
     ADAPTIVE_URL_TEMPLATE = 'http://once.unicornmedia.com/now/master/playlist/%s/%s/%s/content.m3u8'
     PROGRESSIVE_URL_TEMPLATE = 'http://once.unicornmedia.com/now/media/progressive/%s/%s/%s/%s/content.mp4'