Maturenl.23.07.19.petra.x.xxx.1080p.hevc.x265.p...
Based on the pattern you provided:
It looks like you’re trying to complete a filename that follows a common for HD video files. MatureNL.23.07.19.Petra.X.XXX.1080p.HEVC.x265.P...
MatureNL.23.07.19.Petra.X.XXX.1080p.HEVC.x265.P2P.mkv Based on the pattern you provided: It looks
The most logical completion would be:

