[nbc] Add test and fix from dstftw

youtube_dl/extractor/nbc.py

@@ -15,7 +15,7 @@ from ..utils import (
 
 
 class NBCIE(AdobePassIE):
-    _VALID_URL = r'https?(?P<permalink>://(?:www\.)?nbc\.com/(?:classic-tv/|)[^/]+/video/[^/]+/(?P<id>n?\d+))'
+    _VALID_URL = r'https?(?P<permalink>://(?:www\.)?nbc\.com/(?:classic-tv/)?[^/]+/video/[^/]+/(?P<id>n?\d+))'
 
     _TESTS = [
         {
@@ -68,6 +68,23 @@ class NBCIE(AdobePassIE):
             },
             'skip': 'Only works from US',
         }
+        {
+            'url': 'https://www.nbc.com/classic-tv/charles-in-charge/video/charles-in-charge-pilot/n3310',
+            'info_dict': {
+                'id': 'n3310',
+                'ext': 'mp4',
+                'title': 'Charles in Charge: Pilot',
+                'description': 'Charles\' attempt to impress the campus beauty goes awry.',
+                'timestamp': 465638400,
+                'upload_date': '19841003',
+                'uploader': 'NBCU-COM',
+            },
+            'params': {
+                # m3u8 download
+                'skip_download': True,
+            },
+            'skip': 'Only works from US',
+        },
     ]
 
     def _real_extract(self, url):