New: Parse Release Groups with a `-` in their name

(based on radarr commit ea801665e4f3b7c505e2c2f37a4ef941a15e2c2d)

src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs

@@ -38,6 +38,7 @@ namespace NzbDrone.Core.Test.ParserTests
         [TestCase("SomeShow.S20E13.1080p.BluRay.DTS-ES.5.1.x264",null)]
         [TestCase("SomeShow.S20E13.1080p.Blu-Ray.DTS-ES.5.1.x264",null)]
         [TestCase("SomeShow.S20E13.1080p.Blu-Ray.DTS-ES.5.1.x264-ROUGH [PublicHD]", "ROUGH")]
+        [TestCase("SomeShow S01E168 1080p WEB-DL AAC 2.0 x264-Erai-raws", "Erai-raws")]
         //[TestCase("", "")]
         public void should_parse_release_group(string title, string expected)
         {

src/NzbDrone.Core/Parser/Parser.cs

@@ -442,7 +442,7 @@ namespace NzbDrone.Core.Parser
         private static readonly Regex CleanQualityBracketsRegex = new Regex(@"\[[a-z0-9 ._-]+\]$",
                                                                    RegexOptions.IgnoreCase | RegexOptions.Compiled);
 
-        private static readonly Regex ReleaseGroupRegex = new Regex(@"-(?<releasegroup>[a-z0-9]+(?!.+?(?:480p|720p|1080p|2160p)))(?<!.*?WEB-DL|Blu-Ray|480p|720p|1080p|2160p|DTS-HD|DTS-X|DTS-MA|DTS-ES)(?:\b|[-._ ]|$)|[-._ ]\[(?<releasegroup>[a-z0-9]+)\]$",
+        private static readonly Regex ReleaseGroupRegex = new Regex(@"-(?<releasegroup>[a-z0-9]+(?<part2>-[a-z0-9]+)?(?!.+?(?:480p|720p|1080p|2160p)))(?<!(?:WEB-DL|Blu-Ray|480p|720p|1080p|2160p|DTS-HD|DTS-X|DTS-MA|DTS-ES|[ ._]\d{4}-\d{2}|-\d{2})(?:\k<part2>)?)(?:\b|[-._ ]|$)|[-._ ]\[(?<releasegroup>[a-z0-9]+)\]$",
                                                                 RegexOptions.IgnoreCase | RegexOptions.Compiled);