[mlb] Fix extraction of articles

And move test from generic, since it's directly handled by MLBIE

youtube_dl/extractor/mlb.py

@@ -82,6 +82,18 @@ class MLBIE(InfoExtractor):
                 'thumbnail': 're:^https?://.*\.jpg$',
             },
         },
+        {
+            'url': 'http://m.mlb.com/news/article/118550098/blue-jays-kevin-pillar-goes-spidey-up-the-wall-to-rob-tim-beckham-of-a-homer',
+            'md5': 'b190e70141fb9a1552a85426b4da1b5d',
+            'info_dict': {
+                'id': '75609783',
+                'ext': 'mp4',
+                'title': 'Must C: Pillar climbs for catch',
+                'description': '4/15/15: Blue Jays outfielder Kevin Pillar continues his defensive dominance by climbing the wall in left to rob Tim Beckham of a home run',
+                'timestamp': 1429124820,
+                'upload_date': '20150415',
+            }
+        },
         {
             'url': 'http://m.mlb.com/shared/video/embed/embed.html?content_id=35692085&topic_id=6479266&width=400&height=224&property=mlb',
             'only_matching': True,
@@ -113,7 +125,7 @@ class MLBIE(InfoExtractor):
             video_path = mobj.group('path')
             webpage = self._download_webpage(url, video_path)
             video_id = self._search_regex(
-                r'data-videoid="(\d+)"', webpage, 'video id')
+                r'data-video-?id="(\d+)"', webpage, 'video id')
 
         detail = self._download_xml(
             'http://m.mlb.com/gen/multimedia/detail/%s/%s/%s/%s.xml'