diff --git a/src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs b/src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs
index 5db200781..f7374525c 100644
--- a/src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs
+++ b/src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs
@@ -49,7 +49,7 @@ namespace NzbDrone.Core.Test.ParserTests
         [TestCase("Movie.Title.2010.720p.BluRay.x264.-[YTS.LT]", "YTS.LT")]
         [TestCase("The.Movie.Title.2013.720p.BluRay.x264-ROUGH [PublicHD]", "ROUGH")]
         [TestCase("Some.Really.Bad.Movie.Title.[2021].1080p.WEB-HDRip.Dual.Audio.[Hindi.[Clean]. .English].x264.AAC.DD.2.0.By.Full4Movies.mkv-xpost", null)]
-
+        [TestCase("The.Movie.Title.2013.1080p.10bit.AMZN.WEB-DL.DDP5.1.HEVC-Vyndros", "Vyndros")]
         public void should_parse_expected_release_group(string title, string expected)
         {
             Parser.Parser.ParseReleaseGroup(title).Should().Be(expected);
@@ -99,12 +99,17 @@ namespace NzbDrone.Core.Test.ParserTests
         [TestCase("Crappy Anime Movie Name 2017 [RH] [Blu-ray][MKV][h264 10-bit][1080p][FLAC 5.1][Dual Audio][Softsubs (RH)]", "RH")]
         [TestCase("Yet Another Anime Movie 2012 [Kametsu] [Blu-ray][MKV][h264 10-bit][1080p][FLAC 5.1][Dual Audio][Softsubs (Kametsu)]", "Kametsu")]
         [TestCase("Another.Anime.Film.Name.2016.JPN.Blu-Ray.Remux.AVC.DTS-MA.BluDragon", "BluDragon")]
-
         public void should_parse_exception_release_group(string title, string expected)
         {
             Parser.Parser.ParseReleaseGroup(title).Should().Be(expected);
         }
 
+        [TestCase(@"C:\Test\Doctor.Series.2005.s01e01.internal.bdrip.x264-archivist.mkv", "archivist")]
+        public void should_not_include_extension_in_release_group(string title, string expected)
+        {
+            Parser.Parser.ParseReleaseGroup(title).Should().Be(expected);
+        }
+
         [TestCase("Some.Movie.S02E04.720p.WEBRip.x264-SKGTV English", "SKGTV")]
         [TestCase("Some.Movie.S02E04.720p.WEBRip.x264-SKGTV_English", "SKGTV")]
         [TestCase("Some.Movie.S02E04.720p.WEBRip.x264-SKGTV.English", "SKGTV")]
@@ -154,5 +159,11 @@ namespace NzbDrone.Core.Test.ParserTests
         {
             Parser.Parser.ParseReleaseGroup(title).Should().Be(expected);
         }
+
+        [TestCase("Terrible.Anime.Title.2020.DBOX.480p.x264-iKaos [v3] [6AFFEF6B]")]
+        public void should_not_parse_anime_hash_as_release_group(string title)
+        {
+            Parser.Parser.ParseReleaseGroup(title).Should().BeNull();
+        }
     }
 }
diff --git a/src/NzbDrone.Core/Parser/Parser.cs b/src/NzbDrone.Core/Parser/Parser.cs
index 953e02692..4d423c9bb 100644
--- a/src/NzbDrone.Core/Parser/Parser.cs
+++ b/src/NzbDrone.Core/Parser/Parser.cs
@@ -125,6 +125,8 @@ namespace NzbDrone.Core.Parser
         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|-ES|-EN|-CAT|-HDRip|[ ._]\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 Regex(@"^([se]\d+|[0-9a-f]{8})$", RegexOptions.IgnoreCase | RegexOptions.Compiled);
+
         private static readonly Regex AnimeReleaseGroupRegex = new Regex(@"^(?:\[(?<subgroup>(?!\s).+?(?<!\s))\](?:_|-|\s|\.)?)",
                                                                 RegexOptions.IgnoreCase | RegexOptions.Compiled);
 
@@ -465,11 +467,11 @@ namespace NzbDrone.Core.Parser
 
             title = CleanReleaseGroupRegex.Replace(title);
 
-            var exceptionMatch = ExceptionReleaseGroupRegex.Matches(title);
+            var exceptionReleaseGroupRegex = ExceptionReleaseGroupRegex.Matches(title);
 
-            if (exceptionMatch.Count != 0)
+            if (exceptionReleaseGroupRegex.Count != 0)
             {
-                return exceptionMatch.OfType<Match>().Last().Groups["releasegroup"].Value;
+                return exceptionReleaseGroupRegex.OfType<Match>().Last().Groups["releasegroup"].Value;
             }
 
             var exceptionExactMatch = ExceptionReleaseGroupRegexExact.Matches(title);
@@ -491,6 +493,11 @@ namespace NzbDrone.Core.Parser
                     return null;
                 }
 
+                if (InvalidReleaseGroupRegex.IsMatch(group))
+                {
+                    return null;
+                }
+
                 return group;
             }