[extractor/common] Allow quoteless content attribute in og regexes (Closes #7115)

youtube_dl/extractor/common.py

@@ -645,7 +645,7 @@ class InfoExtractor(object):
     # Helper functions for extracting OpenGraph info
     @staticmethod
     def _og_regexes(prop):
-        content_re = r'content=(?:"([^>]+?)"|\'([^>]+?)\')'
+        content_re = r'content=(?:"([^>]+?)"|\'([^>]+?)\'|\s*([^\s"\'=<>`]+?))'
         property_re = r'(?:name|property)=[\'"]?og:%s[\'"]?' % re.escape(prop)
         template = r'<meta[^>]+?%s[^>]+?%s'
         return [