diff --git a/youtube_dl/extractor/restudy.py b/youtube_dl/extractor/restudy.py
index 18e4055f4..d47fb45ca 100644
--- a/youtube_dl/extractor/restudy.py
+++ b/youtube_dl/extractor/restudy.py
@@ -5,8 +5,8 @@ from .common import InfoExtractor
 
 
 class RestudyIE(InfoExtractor):
-    _VALID_URL = r'https?://(?:www\.)?restudy\.dk/video/play/id/(?P<id>[0-9]+)'
-    _TEST = {
+    _VALID_URL = r'https?://(?:(?:www|portal)\.)?restudy\.dk/video/[^/]+/id/(?P<id>[0-9]+)'
+    _TESTS = [{
         'url': 'https://www.restudy.dk/video/play/id/1637',
         'info_dict': {
             'id': '1637',
@@ -18,7 +18,10 @@ class RestudyIE(InfoExtractor):
             # rtmp download
             'skip_download': True,
         }
-    }
+    }, {
+        'url': 'https://portal.restudy.dk/video/leiden-frosteffekt/id/1637',
+        'only_matching': True,
+    }]
 
     def _real_extract(self, url):
         video_id = self._match_id(url)