def get_string_match_types(self):
<EOL>if self._kwargs['<STR_LIT>'] not in ['<STR_LIT>']:<EOL><INDENT>raise errors.IllegalState()<EOL><DEDENT>return self._kwargs['<STR_LIT>']<EOL>
Gets the set of valid string match types for use in validating a string.

        If the string match type indicates a regular expression then
        ``get_string_expression()`` returns a regular expression.

        return: (osid.type.Type) - the set of string match types
        raise:  IllegalState - syntax is not a ``STRING``
        *compliance: mandatory -- This method must be implemented.*