diff --git a/youtube_dl/extractor/wimp.py b/youtube_dl/extractor/wimp.py
index 3377a543e..d6dec25ca 100644
--- a/youtube_dl/extractor/wimp.py
+++ b/youtube_dl/extractor/wimp.py
@@ -37,7 +37,7 @@ def _real_extract(self, url):
         video_id = mobj.group(1)
         webpage = self._download_webpage(url, video_id)
         video_url = self._search_regex(
-            r"'file'\s*:\s*'([^']+)'", webpage, 'video URL')
+            r"[\"']file[\"']\s*[:,]\s*[\"'](.+?)[\"']", webpage, 'video URL')
         if YoutubeIE.suitable(video_url):
             self.to_screen('Found YouTube video')
             return {