Feature request - parse from the end

[Hipapheralkus]

It would be fantastic to let let UploadScanner know, whether the parsed string should be of the 1st, or last occurrence. For example when testing APIs, and one API gets the list of all already uploaded files, but new data are put at the very end/very beginning, this distinction can't be done yet. A checkbox would be amazing to select "parse the first/last occurrence".