diff --git a/yt_dlp/postprocessor/metadatafromfield.py b/yt_dlp/postprocessor/metadatafromfield.py
index 8c795586c..d41ab4bfc 100644
--- a/yt_dlp/postprocessor/metadatafromfield.py
+++ b/yt_dlp/postprocessor/metadatafromfield.py
@@ -27,7 +27,7 @@ class MetadataFromFieldPP(PostProcessor):
 
     @staticmethod
     def field_to_template(tmpl):
-        if re.match(r'\w+$', tmpl):
+        if re.match(r'[a-zA-Z_]+$', tmpl):
             return '%%(%s)s' % tmpl
         return tmpl
 
@@ -63,7 +63,7 @@ class MetadataFromFieldPP(PostProcessor):
                 continue
             for attribute, value in match.groupdict().items():
                 info[attribute] = value
-                self.to_screen('parsed %s from "%s": %s' % (attribute, dictn['in'], value if value is not None else 'NA'))
+                self.to_screen('parsed %s from "%s": %s' % (attribute, dictn['tmpl'], value if value is not None else 'NA'))
         return [], info