[redditr] Fix extraction for URLs with query (closes #14495)

youtube_dl/extractor/reddit.py

@@ -1,5 +1,7 @@
 from __future__ import unicode_literals
 
+import re
+
 from .common import InfoExtractor
 from ..utils import (
     ExtractorError,
@@ -45,7 +47,7 @@ class RedditIE(InfoExtractor):
 
 
 class RedditRIE(InfoExtractor):
-    _VALID_URL = r'https?://(?:www\.)?reddit\.com/r/[^/]+/comments/(?P<id>[^/]+)'
+    _VALID_URL = r'(?P<url>https?://(?:www\.)?reddit\.com/r/[^/]+/comments/(?P<id>[^/?#&]+))'
     _TESTS = [{
         'url': 'https://www.reddit.com/r/videos/comments/6rrwyj/that_small_heart_attack/',
         'info_dict': {
@@ -83,10 +85,13 @@ class RedditRIE(InfoExtractor):
     }]
 
     def _real_extract(self, url):
+        mobj = re.match(self._VALID_URL, url)
+        url, video_id = mobj.group('url', 'id')
+
         video_id = self._match_id(url)
 
         data = self._download_json(
-            url + '.json', video_id)[0]['data']['children'][0]['data']
+            url + '/.json', video_id)[0]['data']['children'][0]['data']
 
         video_url = data['url']