Fix regex string format

lib/ansible/modules/commands/command.py

@@ -127,7 +127,7 @@ OPTIONS = {'chdir': None,
 #   the line is reached
 OPTIONS_REGEX = '|'.join(OPTIONS.keys())
 PARAM_REGEX = re.compile(
-    r'(^|\s)({options_list})=(?P<quote>[\'"])?(.*?)(?(quote)(?<!\\)(?P=quote))((?<!\\)(?=\s)|$)'.format(
+    r'(^|\s)({options_regex})=(?P<quote>[\'"])?(.*?)(?(quote)(?<!\\)(?P=quote))((?<!\\)(?=\s)|$)'.format(
         options_regex=OPTIONS_REGEX
     )
 )