I’m splitting up my UHD content from normal content on my server by using editions.
Found that naming the movie either of these ways:
Movie (2000) {edition-[UHD]}/Movie (2000) {edition-[UHD]}.mkv
Movie (2000) {edition-[UHD] Director's Cut}/Movie (2000) {edition-[UHD] Director's Cut}.mkv
That the movie shows up in the Plex clients with an edition of [UHD.
Since { and [ are interchangeable (although not documented as such), this is most likely a regex bug where it is looking for an ending ] OR an ending } and then not looking for more characters.
I’ll just end up renaming the folders, but thought it would look nicer being:
[UHD] Director’s Cut than UHD Director’s Cut
Please add this to your backlog to address.
They are not.
Square brackets have a different function in Plex. Plex will ignore the content of the first pair of square brackets, so it doesn’t interfere with the matching process.
This is how I separate 4K versions from others.
Deadpool 2 (2018) {Edition - Super Duper Cut} [1080p]
Deadpool 2 (2018) {Edition - 4K Super Duper Cut} [2160p]
Please try this name and you will see that the 2nd set of [] also impacts how the file name is parsed:
Blade Runner 2049 (2017) [UHD,HDR10,22 mbps,MLP FBA+DTS 5.1+AC3 5.1] {edition-[UHD]}.mkv
Unfortunately, they are. Please also look at this example, where the file is named as such:
Blade Runner 2049 (2017) [UHD,HDR10,22 mbps,MLP FBA+DTS 5.1+AC3 5.1] [edition-TEST].mkv
As you can see, it will still use [] for things like edition. I know this is just for flexibility, but I do think this is why my initial BUG exists. There are other posts showing the interchangeability of [] and {}.
Any further comment, @OttoKerner ? Will this be added to the backlog for the project team to investigate and fix?
An option to not address the issue and yet educate people is to update the naming documentation to add a warning that [] within the edition does not work as expected and to avoid doing that unless the user is OK with manually editing the metadata to align with the file name.
Added, thanks for reporting. 
