Please note that every trivial solution that does not reverse the string and pattern will fail in the edge case of overlapping patterns. Let's say you have the string "01-02-03" and you want to find the last match of "\d{2}-\d{2}". Using findall/finditer with [-1] will NOT return "02-03" but "01-02".

(To get a solution that does not reverse the string, all overlapping patterns must be in the results, then the [-1]-method does work.)

(As I do not have enough reputation to leave a comment, I have to leave an answer instead.)