Fixed: False positive HC for MultiSubs (#10024)

* Fixed: Multisubs wrongly detected as hardcoded

As flagged by multiple people before "Multisubs" is a commonly used Tag that indicates that the file has more than 3 subtitle languages. Multisubs never indicate a hardcoded sub as you cannot have a multisubs where you can select between different languages if the subtitles are hardcoded in the video. This minor change excludes "MULTISUBS" from the regex used.

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

@@ -272,6 +272,7 @@ namespace NzbDrone.Core.Test.ParserTests
         [TestCase("Movie.Title.2000.1080p.BlueRay.x264.DTS.RoSubbed-playHD", null)]
         [TestCase("Movie Title! 2018 [Web][MKV][h264][480p][AAC 2.0][Softsubs]", null)]
         [TestCase("Movie Title! 2019 [HorribleSubs][Web][MKV][h264][848x480][AAC 2.0][Softsubs(HorribleSubs)]", null)]
+        [TestCase("Movie Title! 2024 [Web][x265][1080p][EAC3][MultiSubs]", null)]
         public void should_parse_hardcoded_subs(string postTitle, string sub)
         {
             Parser.Parser.ParseMovieTitle(postTitle).HardcodedSubs.Should().Be(sub);

src/NzbDrone.Core/Parser/Parser.cs

@@ -18,7 +18,7 @@ namespace NzbDrone.Core.Parser
 
         private static readonly Regex ReportEditionRegex = new Regex(@"^.+?" + EditionRegex, RegexOptions.Compiled | RegexOptions.IgnoreCase);
 
-        private static readonly Regex HardcodedSubsRegex = new Regex(@"\b((?<hcsub>(\w+(?<!SOFT|HORRIBLE)SUBS?))|(?<hc>(HC|SUBBED)))\b",
+        private static readonly Regex HardcodedSubsRegex = new Regex(@"\b((?<hcsub>(\w+(?<!SOFT|MULTI|HORRIBLE)SUBS?))|(?<hc>(HC|SUBBED)))\b",
                                                         RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);
 
         private static readonly RegexReplace[] PreSubstitutionRegex = Array.Empty<RegexReplace>();