Use the renaming feature in Sonarr and Radarr. It renames both folder and file.
https://trash-guides.info/Radarr/Radarr-recommended-naming-scheme/
https://trash-guides.info/Sonarr/Sonarr-recommended-naming-scheme/
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Are you using sonarr/radarr to do your renaming? I have mine set to patterns that put the release group at the end. It usually has no problem picking up release groups at the beginning (especially for anime, that seems to be pretty common), so by the time it's auto imported, the filenames have been normalized to standard format with release group at the end.
Radarr/Sonarr: Change the naming scheme, select every release, hit "rename"
I want to say Sonarr has a regex renaming feature, but I may just be making that up as I'm not looking at my instance right now. Doing whatever renaming based on a pattern would be preferable during the download phase in order to keep the metadata of each service clean.
Failing that, if you have a predictable list of release group strings you want removed from filenames, a one liner with sed or similar would take care of this. You'd then break the known locations of these files by any service tracking them of course, but they will eventually be reindexed.
Why do you care about the filename at all? As long as radarr knows and Jellyfin/Plex knows then it’s all good
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Look into using power rename from MS power toys if you're using windows or the rename CLI command in Linux
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