Fixed: Forced Subs not parsed by SubtitleLanguageRegex (#3384)

Fixes #2908

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

@@ -66,6 +66,8 @@ namespace NzbDrone.Core.Test.ParserTests
         [TestCase("2 Broke Girls - S01E01 - Pilot.en.sub", Language.English)]
         [TestCase("2 Broke Girls - S01E01 - Pilot.eng.sub", Language.English)]
         [TestCase("2 Broke Girls - S01E01 - Pilot.sub", Language.Unknown)]
+        [TestCase("2 Broke Girls - S01E01 - Pilot.eng.forced.sub", Language.English)]
+        [TestCase("2 Broke Girls - S01E01 - Pilot-eng-forced.sub", Language.English)]
         public void should_parse_subtitle_language(string fileName, Language language)
         {
             var result = LanguageParser.ParseSubtitleLanguage(fileName);

src/NzbDrone.Core/Parser/LanguageParser.cs

@@ -16,7 +16,7 @@ namespace NzbDrone.Core.Parser
         private static readonly Regex LanguageRegex = new Regex(@"(?:\W|_)(?<italian>\b(?:ita|italian)\b)|(?<german>german\b|videomann)|(?<flemish>flemish)|(?<greek>greek)|(?<french>(?:\W|_)(?:FR|VOSTFR|VO|VFF|VFQ|VF2|TRUEFRENCH)(?:\W|_))|(?<russian>\brus\b)|(?<dutch>nl\W?subs?)|(?<hungarian>\b(?:HUNDUB|HUN)\b)|(?<hebrew>\bHebDub\b)|(?<czech>\b(?:CZ|SK)\b)",
                                                                 RegexOptions.IgnoreCase | RegexOptions.Compiled);
 
-        private static readonly Regex SubtitleLanguageRegex = new Regex(".+?[-_. ](?<iso_code>[a-z]{2,3})$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+        private static readonly Regex SubtitleLanguageRegex = new Regex(".+?[-_. ](?<iso_code>[a-z]{2,3})(?:[-_. ]forced)?$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
 
         public static List<Language> ParseLanguages(string title)
         {