Literal asterisk (\*) in shortanswer question not handled correctly by get_correct_responses

Asterisk is a wildcard symbol in shortanswer question. The problem is with asterisk, that actually needs to apperar in answer. If I use simple asterisk, it accept any symbols; if I escape it (*) , moodle will expect literally this as an answer: *.

I failed to find a way to include * without preceding backslash in an answer to the shortanswer question.