[slutload] Fix test and simplify

youtube_dl/extractor/slutload.py

@@ -1,7 +1,5 @@
 from __future__ import unicode_literals
 
-import re
-
 from .common import InfoExtractor
 
 
@@ -9,7 +7,7 @@ class SlutloadIE(InfoExtractor):
     _VALID_URL = r'^https?://(?:\w+\.)?slutload\.com/video/[^/]+/(?P<id>[^/]+)/?$'
     _TEST = {
         'url': 'http://www.slutload.com/video/virginie-baisee-en-cam/TD73btpBqSxc/',
-        'md5': '0cf531ae8006b530bd9df947a6a0df77',
+        'md5': '868309628ba00fd488cf516a113fd717',
         'info_dict': {
             'id': 'TD73btpBqSxc',
             'ext': 'mp4',
@@ -20,9 +18,7 @@ class SlutloadIE(InfoExtractor):
     }
 
     def _real_extract(self, url):
-        mobj = re.match(self._VALID_URL, url)
-        video_id = mobj.group('id')
-
+        video_id = self._match_id(url)
         webpage = self._download_webpage(url, video_id)
 
         video_title = self._html_search_regex(r'<h1><strong>([^<]+)</strong>',