Fixed: Sub group parsing could result in extra brackets being parsed

Closes #7994

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

@@ -0,0 +1,19 @@
+using FluentAssertions;
+using NUnit.Framework;
+using NzbDrone.Core.Test.Framework;
+
+namespace NzbDrone.Core.Test.ParserTests
+{
+    [TestFixture]
+    public class SubGroupParserFixture : CoreTest
+    {
+        [TestCase("[GHOST][1080p] Series - 25 [BD HEVC 10bit Dual Audio AC3][AE0ADDBA]", "GHOST")]
+        public void should_parse_sub_group_from_title_as_release_group(string title, string expected)
+        {
+            var result = Parser.Parser.ParseTitle(title);
+
+            result.Should().NotBeNull();
+            result.ReleaseGroup.Should().Be(expected);
+        }
+    }
+}