[vine] Use _search_regex for JSON data (Closes #7254, closes #7255)

youtube_dl/extractor/vine.py

@@ -85,8 +85,8 @@ class VineIE(InfoExtractor):
         webpage = self._download_webpage('https://vine.co/v/' + video_id, video_id)
 
         data = self._parse_json(
-            self._html_search_regex(
-                r'window\.POST_DATA = { %s: ({.+?}) };\s*</script>' % video_id,
+            self._search_regex(
+                r'window\.POST_DATA\s*=\s*{\s*%s\s*:\s*({.+?})\s*};\s*</script>' % video_id,
                 webpage, 'vine data'),
             video_id)