[irrtoolset]AS-path filters in RtConfig

Dear all, Can anybody tell me what has changed in the version 4.8.x (compared to 4.7.x) that such input: @RtConfig aspath_access_list filter <AS8308$> ends up in: Error: badly formed AS_path filter. It worked in the previous version. I looked into RFC2622, and there is an example of the filter: <AS2$> Does it need any quotation or something? Did anybody have this problem? Thanks --PE