diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 242618c58..0082a4c84 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -645,7 +645,7 @@ def _get_tfa_info(self, note='two-factor verification code'):
     # 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 [