diff --git a/youtube_dl/extractor/unity.py b/youtube_dl/extractor/unity.py
index 793346ac0..73daacf29 100644
--- a/youtube_dl/extractor/unity.py
+++ b/youtube_dl/extractor/unity.py
@@ -5,7 +5,7 @@ from .youtube import YoutubeIE
 
 
 class UnityIE(InfoExtractor):
-    _VALID_URL = r'https?://(?:www\.)?unity3d\.com/learn/tutorials/(?:.*)/(?P<id>[0-9a-zA-Z-]+)'
+    _VALID_URL = r'https?://(?:www\.)?unity3d\.com/learn/tutorials/(?:[^/]+/)*(?P<id>[^/?#&]+)'
     _TESTS = [{
         'url': 'https://unity3d.com/learn/tutorials/topics/animation/animate-anything-mecanim',
         'info_dict': {