align parsing with upstream

Separate release group parsing logic into dedicated classes and update references throughout codebase.

(cherry picked from commit b00229e53c7a4bcb8684fd0aa4f66650c64a9a20)

Co-Authored-By: Mark McDowall <mark@mcdowall.ca>

src/NzbDrone.Core/Parser/ReleaseGroupParser.cs

@@ -0,0 +1,87 @@
+using System.Linq;
+using System.Text.RegularExpressions;
+using NzbDrone.Core.MediaFiles;
+
+namespace NzbDrone.Core.Parser;
+
+public static class ReleaseGroupParser
+{
+    private static readonly Regex ReleaseGroupRegex = new (@"-(?<releasegroup>[a-z0-9]+(?<part2>-[a-z0-9]+)?(?!.+?(?:480p|576p|720p|1080p|2160p)))(?<!(?:WEB-(DL|Rip)|Blu-Ray|480p|576p|720p|1080p|2160p|DTS-HD|DTS-X|DTS-MA|DTS-ES|-ES|-EN|-CAT|-ENG|-JAP|-GER|-FRA|-FRE|-ITA|-HDRip|\d{1,2}-bit|[ ._]\d{4}-\d{2}|-\d{2}|tmdb(id)?-(?<tmdbid>\d+)|(?<imdbid>tt\d{7,8}))(?:\k<part2>)?)(?:\b|[-._ ]|$)|[-._ ]\[(?<releasegroup>[a-z0-9]+)\]$",
+        RegexOptions.IgnoreCase | RegexOptions.Compiled);
+
+    private static readonly Regex InvalidReleaseGroupRegex = new (@"^([se]\d+|[0-9a-f]{8})$", RegexOptions.IgnoreCase | RegexOptions.Compiled);
+
+    private static readonly Regex AnimeReleaseGroupRegex = new (@"^(?:\[(?<subgroup>(?!\s).+?(?<!\s))\](?:_|-|\s|\.)?)",
+        RegexOptions.IgnoreCase | RegexOptions.Compiled);
+
+    // Handle Exception Release Groups that don't follow -RlsGrp; Manual List
+    // name only...be very careful with this last; high chance of false positives
+    private static readonly Regex ExceptionReleaseGroupRegexExact = new (@"\b(?<releasegroup>KRaLiMaRKo|E\.N\.D|D\-Z0N3|Koten_Gars|BluDragon|ZØNEHD|Tigole|HQMUX|VARYG|YIFY|YTS(.(MX|LT|AG))?|TMd|Eml HDTeam|LMain|DarQ|BEN THE MEN)\b", RegexOptions.IgnoreCase | RegexOptions.Compiled);
+
+    // groups whose releases end with RlsGroup) or RlsGroup]
+    private static readonly Regex ExceptionReleaseGroupRegex = new (@"(?<=[._ \[])(?<releasegroup>(Silence|afm72|Panda|Ghost|MONOLITH|Tigole|Joy|ImE|UTR|t3nzin|Anime Time|Project Angel|Hakata Ramen|HONE|Vyndros|SEV|Garshasp|Kappa|Natty|RCVR|SAMPA|YOGI|r00t|EDGE2020|RZeroX|FreetheFish|Anna|Bandi|Qman|theincognito|HDO|DusIctv|DHD|CtrlHD|-ZR-|ADC|XZVN|RH|Kametsu)(?=\]|\)))", RegexOptions.IgnoreCase | RegexOptions.Compiled);
+
+    private static readonly RegexReplace CleanReleaseGroupRegex = new (@"(-(RP|1|NZBGeek|Obfuscated|Obfuscation|Scrambled|sample|Pre|postbot|xpost|Rakuv[a-z0-9]*|WhiteRev|BUYMORE|AsRequested|AlternativeToRequested|GEROV|Z0iDS3N|Chamele0n|4P|4Planet|AlteZachen|RePACKPOST))+$",
+        string.Empty,
+        RegexOptions.IgnoreCase | RegexOptions.Compiled);
+
+    public static string ParseReleaseGroup(string title)
+    {
+        title = title.Trim();
+        title = FileExtensions.RemoveFileExtension(title);
+        foreach (var replace in ParserCommon.PreSubstitutionRegex)
+        {
+            if (replace.TryReplace(ref title))
+            {
+                break;
+            }
+        }
+
+        title = ParserCommon.WebsitePrefixRegex.Replace(title);
+        title = ParserCommon.CleanTorrentSuffixRegex.Replace(title);
+
+        var animeMatch = AnimeReleaseGroupRegex.Match(title);
+
+        if (animeMatch.Success)
+        {
+            return animeMatch.Groups["subgroup"].Value;
+        }
+
+        title = CleanReleaseGroupRegex.Replace(title);
+
+        var exceptionReleaseGroupRegex = ExceptionReleaseGroupRegex.Matches(title);
+
+        if (exceptionReleaseGroupRegex.Count != 0)
+        {
+            return exceptionReleaseGroupRegex.OfType<Match>().Last().Groups["releasegroup"].Value;
+        }
+
+        var exceptionExactMatch = ExceptionReleaseGroupRegexExact.Matches(title);
+
+        if (exceptionExactMatch.Count != 0)
+        {
+            return exceptionExactMatch.OfType<Match>().Last().Groups["releasegroup"].Value;
+        }
+
+        var matches = ReleaseGroupRegex.Matches(title);
+
+        if (matches.Count != 0)
+        {
+            var group = matches.OfType<Match>().Last().Groups["releasegroup"].Value;
+
+            if (int.TryParse(group, out _))
+            {
+                return null;
+            }
+
+            if (InvalidReleaseGroupRegex.IsMatch(group))
+            {
+                return null;
+            }
+
+            return group;
+        }
+
+        return null;
+    }
+}