[nick] support nickjr.com (closes #7542)

youtube_dl/extractor/nick.py

@@ -8,7 +8,7 @@ from ..utils import update_url_query
 
 class NickIE(MTVServicesInfoExtractor):
     IE_NAME = 'nick.com'
-    _VALID_URL = r'https?://(?:www\.)?nick\.com/videos/clip/(?P<id>[^/?#.]+)'
+    _VALID_URL = r'https?://(?:www\.)?nick(?:jr)?\.com/(?:videos/clip|[^/]+/videos)/(?P<id>[^/?#.]+)'
     _FEED_URL = 'http://udat.mtvnservices.com/service1/dispatch.htm'
     _TESTS = [{
         'url': 'http://www.nick.com/videos/clip/alvinnn-and-the-chipmunks-112-full-episode.html',
@@ -52,6 +52,9 @@ class NickIE(MTVServicesInfoExtractor):
                 }
             },
         ],
+    }, {
+        'url': 'http://www.nickjr.com/paw-patrol/videos/pups-save-a-goldrush-s3-ep302-full-episode/',
+        'only_matching': True,
     }]
 
     def _get_feed_query(self, uri):