[npo] Improve _VALID_URL (closes #13376)

youtube_dl/extractor/npo.py

@@ -35,7 +35,7 @@ class NPOIE(NPOBaseIE):
                         https?://
                             (?:www\.)?
                             (?:
-                                npo\.nl/(?!live|radio)(?:[^/]+/){2}|
+                                npo\.nl/(?!(?:live|radio)/)(?:[^/]+/){2}|
                                 ntr\.nl/(?:[^/]+/){2,}|
                                 omroepwnl\.nl/video/fragment/[^/]+__|
                                 zapp\.nl/[^/]+/[^/]+/
@@ -150,6 +150,9 @@ class NPOIE(NPOBaseIE):
         # live stream
         'url': 'npo:LI_NL1_4188102',
         'only_matching': True,
+    }, {
+        'url': 'http://www.npo.nl/radio-gaga/13-06-2017/BNN_101383373',
+        'only_matching': True,
     }]
 
     def _real_extract(self, url):