class MooshareIE(InfoExtractor):
     IE_NAME = 'mooshare'
     IE_DESC = 'Mooshare.biz'
-    _VALID_URL = r'http://mooshare\.biz/(?P<id>[\da-z]{12})'
+    _VALID_URL = r'http://(?:www\.)?mooshare\.biz/(?P<id>[\da-z]{12})'
 
     _TESTS = [
         {
         page = self._download_webpage(url, video_id, 'Downloading page')
 
         if re.search(r'>Video Not Found or Deleted<', page) is not None:
-            raise ExtractorError(u'Video %s does not exist' % video_id, expected=True)
+            raise ExtractorError('Video %s does not exist' % video_id, expected=True)
 
         hash_key = self._html_search_regex(r'<input type="hidden" name="hash" value="([^"]+)">', page, 'hash')
         title = self._html_search_regex(r'(?m)<div class="blockTitle">\s*<h2>Watch ([^<]+)</h2>', page, 'title')
             'thumbnail': thumbnail,
             'duration': duration,
             'formats': formats,
-        }
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+        }