Fixed: parsing of files without a title and a 4 digit season number

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

@@ -85,6 +85,10 @@ namespace NzbDrone.Core.Test.ParserTests
         [TestCase("Top Gear - 06x11 - 2005.08.07", "Top Gear", 6, 11)]
         [TestCase("The_Voice_US_s06e19_04.28.2014_hdtv.x264.Poke.mp4", "The Voice US", 6, 19)]
         [TestCase("the.100.110.hdtv-lol", "The 100", 1, 10)]
+        [TestCase("2009x09 [SDTV].avi", "", 2009, 9)]
+        [TestCase("S2009E09 [SDTV].avi", "", 2009, 9)]
+        [TestCase("Shark Week S2009E09 [SDTV].avi", "Shark Week", 2009, 9)]
+//        [TestCase("", "", 0, 0)]
         public void should_parse_single_episode(string postTitle, string title, int seasonNumber, int episodeNumber)
         {
             var result = Parser.Parser.ParseTitle(postTitle);

src/NzbDrone.Core/Parser/Parser.cs

@@ -43,15 +43,11 @@ namespace NzbDrone.Core.Parser
                           RegexOptions.IgnoreCase | RegexOptions.Compiled),
 
                 //Episodes without a title, Single (S01E05, 1x05) AND Multi (S01E04E05, 1x04x05, etc)
-                new Regex(@"^(?:S?(?<season>(?<!\d+)\d{1,2}(?!\d+))(?:(?:\-|[ex]|\W[ex]|_){1,2}(?<episode>\d{2,3}(?!\d+)))+)",
+                new Regex(@"^(?:S?(?<season>(?<!\d+)(?:\d{1,2}|\d{4})(?!\d+))(?:(?:\-|[ex]|\W[ex]|_){1,2}(?<episode>\d{2,3}(?!\d+)))+)",
                           RegexOptions.IgnoreCase | RegexOptions.Compiled),
 
                 //Episodes with a title, Single episodes (S01E05, 1x05, etc) & Multi-episode (S01E05E06, S01E05-06, S01E05 E06, etc)
-                new Regex(@"^(?<title>.+?)(?:(\W|_)+S?(?<season>(?<!\d+)\d{1,2}(?!\d+))(?:[ex]|\W[ex]|_){1,2}(?<episode>\d{2,3}(?!\d+))(?:(?:\-|[ex]|\W[ex]|_){1,2}(?<episode>\d{2,3}(?!\d+)))*)\W?(?!\\)",
+                new Regex(@"^(?<title>.+?)(?:(\W|_)+S?(?<season>(?<!\d+)(?:\d{1,2}|\d{4})(?!\d+))(?:[ex]|\W[ex]|_){1,2}(?<episode>\d{2,3}(?!\d+))(?:(?:\-|[ex]|\W[ex]|_){1,2}(?<episode>\d{2,3}(?!\d+)))*)\W?(?!\\)",
-                          RegexOptions.IgnoreCase | RegexOptions.Compiled),
-
-                //Episodes with a title, Single episodes (S01E05, 1x05, etc) & Multi-episode (S01E05E06, S01E05-06, S01E05 E06, etc)
-                new Regex(@"^(?<title>.+?)(?:\W+S?(?<season>(?<!\d+)(?:\d{1,2}|\d{4})(?!\d+))(?:[ex]|\W[ex]){1,2}(?<episode>\d{2,3}(?!\d+))(?:(?:\-|[ex]|\W[ex]){1,2}(?<episode>\d{2,3}(?!\d+)))*)",
                           RegexOptions.IgnoreCase | RegexOptions.Compiled),
 
                 //Anime - Title Absolute Episode Number [SubGroup]