sure, open a github issue but first some history.
in the past, rclone only supports globs, then i found a bug that enabled regex.
then, based on that, rclone officially added support for regex.
https://forum.rclone.org/t/rclone-copy-using-regex-expression-using-include-multiple-expression-for-file-name/26846/15
which lead to
https://github.com/rclone/rclone/pull/5700
https://forum.rclone.org/t/full-support-for-regex-for-filters/26883/1