Fixed: CRC32 being parsed as release group

Closes #4449

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

@@ -101,5 +101,11 @@ namespace NzbDrone.Core.Test.ParserTests
         {
             Parser.Parser.ParseReleaseGroup(title).Should().Be(expected);
         }
+
+        [TestCase("Terrible.Anime.Title.001.DBOX.480p.x264-iKaos [v3] [6AFFEF6B]")]
+        public void should_not_parse_anime_hash_as_release_group(string title)
+        {
+            Parser.Parser.ParseReleaseGroup(title).Should().BeNull();
+        }
     }
 }

src/NzbDrone.Core/Parser/Parser.cs

@@ -423,7 +423,7 @@ namespace NzbDrone.Core.Parser
                                                                 RegexOptions.IgnoreCase | RegexOptions.Compiled);
 
 
-        private static readonly Regex InvalidReleaseGroupRegex = new Regex(@"^[se]\d+$", RegexOptions.IgnoreCase | RegexOptions.Compiled);
+        private static readonly Regex InvalidReleaseGroupRegex = new Regex(@"^([se]\d+|[0-9a-f]{8})$", RegexOptions.IgnoreCase | RegexOptions.Compiled);
 
 
         private static readonly Regex AnimeReleaseGroupRegex = new Regex(@"^(?:\[(?<subgroup>(?!\s).+?(?<!\s))\](?:_|-|\s|\.)?)",