diff --git a/src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs b/src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs
index d61e7cae5..0677d4b46 100644
--- a/src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs
+++ b/src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs
@@ -37,6 +37,10 @@ namespace NzbDrone.Core.Test.ParserTests
         [TestCase("NCIS.S16E04.Third.Wheel.1080p.AMZN.WEB-DL.DDP5.1.H.264-NTb-GEROV", "NTb")]
         [TestCase("Will.and.Grace.S10E06.Kid.n.Play.1080p.AMZN.WEB-DL.DDP5.1.H.264-NTb-Z0iDS3N", "NTb")]
         [TestCase("Absolute.Power.S02E06.The.House.of.Lords.DVDRip.x264-MaG-Chamele0n", "MaG")]
+        [TestCase("The.Nightingale.2018.1080p.Blu-ray.Remux.AVC.DTS-HD.MA.5.1.KRaLiMaRKo", null)]
+        [TestCase("Kai.Po.Che.2013.1080p.BluRay.REMUX.AVC.DTS-X.MA.5.1", null)]
+        [TestCase("Kai.Po.Che.2013.1080p.BluRay.REMUX.AVC.DTS-MA.5.1", null)]
+        [TestCase("Kai.Po.Che.2013.1080p.BluRay.REMUX.AVC.DTS-ES.MA.5.1", null)]
 
         //[TestCase("", "")]
         public void should_parse_release_group(string title, string expected)
diff --git a/src/NzbDrone.Core/Parser/Parser.cs b/src/NzbDrone.Core/Parser/Parser.cs
index a4ee4936f..3dd198a24 100644
--- a/src/NzbDrone.Core/Parser/Parser.cs
+++ b/src/NzbDrone.Core/Parser/Parser.cs
@@ -119,7 +119,7 @@ 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|480p|720p|1080p|2160p)(?:\b|[-._ ]|$)|[-._ ]\[(?<releasegroup>[a-z0-9]+)\]$",
+        private static readonly Regex ReleaseGroupRegex = new Regex(@"-(?<releasegroup>[a-z0-9]+(?!.+?(?:480p|720p|1080p|2160p)))(?<!.*?WEB-DL|Blu-Ray|480p|720p|1080p|2160p|DTS-HD|DTS-X|DTS-MA|DTS-ES)(?:\b|[-._ ]|$)|[-._ ]\[(?<releasegroup>[a-z0-9]+)\]$",
                                                                 RegexOptions.IgnoreCase | RegexOptions.Compiled);
 
         private static readonly Regex AnimeReleaseGroupRegex = new Regex(@"^(?:\[(?<subgroup>(?!\s).+?(?<!\s))\](?:_|-|\s|\.)?)",