Fixed: Parsing of 4 digit episode number with 4 digit season number

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

@@ -145,6 +145,8 @@ namespace NzbDrone.Core.Test.ParserTests
         [TestCase("Series.Title.Of.S01E01.xyz", "Series Title Of", 1, 1)]
         [TestCase("[RlsGrp] Series Title - S01E27 - 24-Hour", "Series Title", 1, 27)]
         [TestCase("Series Title - S02E01 1920x910", "Series Title", 2, 1)]
+        [TestCase("Anime Title - S2020E1527 [1527] [2020-10-11] - Episode Title", "Anime Title", 2020, 1527)]
+        [TestCase("Anime Title - S2010E994 [0994] [2010-02-28] - Episode Title [x264 720p][AAC 2ch][HS][Shion+GakiDave]", "Anime Title", 2010, 994)]
         //[TestCase("", "", 0, 0)]
         public void should_parse_single_episode(string postTitle, string title, int seasonNumber, int episodeNumber)
         {

src/NzbDrone.Core/Parser/Parser.cs

@@ -161,11 +161,11 @@ namespace NzbDrone.Core.Parser
                           RegexOptions.IgnoreCase | RegexOptions.Compiled),
 
                 //Episodes with a title, 4 digit season number, Single episodes (S2016E05, etc) & Multi-episode (S2016E05E06, S2016E05-06, S2016E05 E06, etc)
-                new Regex(@"^(?<title>.+?)(?:(?:[-_\W](?<![()\[!]))+S(?<season>(?<!\d+)(?:\d{4})(?!\d+))(?:e|\We|_){1,2}(?<episode>\d{2,3}(?!\d+))(?:(?:\-|e|\We|_){1,2}(?<episode>\d{2,3}(?!\d+)))*)\W?(?!\\)",
+                new Regex(@"^(?<title>.+?)(?:(?:[-_\W](?<![()\[!]))+S(?<season>(?<!\d+)(?:\d{4})(?!\d+))(?:e|\We|_){1,2}(?<episode>\d{2,4}(?!\d+))(?:(?:\-|e|\We|_){1,2}(?<episode>\d{2,3}(?!\d+)))*)\W?(?!\\)",
                           RegexOptions.IgnoreCase | RegexOptions.Compiled),
 
                 //Episodes with a title, 4 digit season number, Single episodes (2016x05, etc) & Multi-episode (2016x05x06, 2016x05-06, 2016x05 x06, etc)
-                new Regex(@"^(?<title>.+?)(?:(?:[-_\W](?<![()\[!]))+(?<season>(?<!\d+)(?:\d{4})(?!\d+))(?:x|\Wx){1,2}(?<episode>\d{2,3}(?!\d+))(?:(?:\-|x|\Wx|_){1,2}(?<episode>\d{2,3}(?!\d+)))*)\W?(?!\\)",
+                new Regex(@"^(?<title>.+?)(?:(?:[-_\W](?<![()\[!]))+(?<season>(?<!\d+)(?:\d{4})(?!\d+))(?:x|\Wx){1,2}(?<episode>\d{2,4}(?!\d+))(?:(?:\-|x|\Wx|_){1,2}(?<episode>\d{2,3}(?!\d+)))*)\W?(?!\\)",
                           RegexOptions.IgnoreCase | RegexOptions.Compiled),
 
                 // Multi-season pack