regex compat

Author: jonmmease

packages/python/plotly/plotly/validator_cache.py

@@ -21,7 +21,7 @@ def get_validator(parent_path, prop_name):
 
                     match = Layout._subplotid_prop_re.match(prop_name)
                     if match:
-                        lookup_name = match[1]
+                        lookup_name = match.group(1)
 
                 lookup_name = lookup_name or prop_name
                 class_name = lookup_name.title() + "Validator"