Since nothing is (grouped) inside of the "Match", the posted answer needs a checkmark inside for "v2". But remember, it removes "_" followed by any 6-thru-8 digits, from anywhere inside of the filenames. To only remove dates like _YYYYMMDD from the very end, can use a "Match" and "Replace" like... (.+)_(19|20)\d{6}$ \1
Or to remove ending dates like either _YYYYMD or _YYYYMMDD... (.+)_(19|20)\d{4,6}$ \1