def parse(cls, parser, text, pos):
        """Checks if terminal token is a keyword after lower-casing it."""
        match = cls.regex.match(text)
        if match:
            # Check if match is is not in the grammar of the specific keyword class.
            if match.group(0).lower() not in cls.grammar:
                result = text, SyntaxError(repr(match.group(0)) + " is not a member of " + repr(cls.grammar))
            else:
                result = text[len(match.group(0)):], cls(match.group(0))
        else:
            result = text, SyntaxError("expecting " + repr(cls.__name__))
        return result
Checks if terminal token is a keyword after lower-casing it.