How to use the certbot-apache.certbot_apache._internal.parser.ApacheParser function in certbot-apache

arg = os.path.normpath(os.path.join(self.root, arg))
        else:
            arg = os.path.normpath(arg)

        # Attempts to add a transform to the file if one does not already exist
        if os.path.isdir(arg):
            self.parse_file(os.path.join(arg, "*"))
        else:
            self.parse_file(arg)

        # Argument represents an fnmatch regular expression, convert it
        # Split up the path and convert each into an Augeas accepted regex
        # then reassemble
        split_arg = arg.split("/")
        for idx, split in enumerate(split_arg):
            if any(char in ApacheParser.fnmatch_chars for char in split):
                # Turn it into a augeas regex
                # TODO: Can this instead be an augeas glob instead of regex
                split_arg[idx] = ("* [label()=~regexp('%s')]" %
                                  self.fnmatch_to_re(split))
        # Reassemble the argument
        # Note: This also normalizes the argument /serverroot/ -> /serverroot
        arg = "/".join(split_arg)

        return get_aug_path(arg)

This also converts all variables and parameters appropriately.

        """
        value = self.aug.get(match)

        # No need to strip quotes for variables, as apache2ctl already does
        # this, but we do need to strip quotes for all normal arguments.

        # Note: normal argument may be a quoted variable
        # e.g. strip now, not later
        if not value:
            return None
        value = value.strip("'\"")

        variables = ApacheParser.arg_var_interpreter.findall(value)

        for var in variables:
            # Strip off ${ and }
            try:
                value = value.replace(var, self.variables[var[2:-1]])
            except KeyError:
                raise errors.PluginError("Error Parsing variable: %s" % var)

        return value