Fixed: Parsing of single episode numbers

Closes #5022

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

@@ -149,6 +149,8 @@ namespace NzbDrone.Core.Test.ParserTests
         [TestCase("Anime Title - S2010E994 [0994] [2010-02-28] - Episode Title [x264 720p][AAC 2ch][HS][Shion+GakiDave]", "Anime Title", 2010, 994)]
         [TestCase("Series Title - Temporada 2 [HDTV 720p][Cap.201][AC3 5.1 Castellano][www.pctnew.com]", "Series Title", 2, 1)]
         [TestCase("Series Title - Temporada 2 [HDTV 720p][Cap.1901][AC3 5.1 Castellano][www.pctnew.com]", "Series Title", 19, 1)]
+        [TestCase("Series Title 1x1", "Series Title", 1, 1)]
+        [TestCase("1x1", "", 1, 1)]
         //[TestCase("", "", 0, 0)]
         public void should_parse_single_episode(string postTitle, string title, int seasonNumber, int episodeNumber)
         {

src/NzbDrone.Core/Parser/Parser.cs

@@ -351,6 +351,10 @@ namespace NzbDrone.Core.Parser
                 //Season only releases for poorly named anime
                 new Regex(@"^(?:\[(?<subgroup>.+?)\][-_. ])?(?<title>.+?)[-_. ]+?[\[(](?:S|Season|Saison|Series)[-_. ]?(?<season>\d{1,2}(?![-_. ]?\d+))(?:[-_. )\]]|$)+(?<extras>EXTRAS|SUBPACK)?(?!\\)",
                     RegexOptions.IgnoreCase | RegexOptions.Compiled),
+
+                //Episodes without a title, Single episode numbers (S1E1, 1x1)
+                new Regex(@"^(?:S?(?<season>(?<!\d+)(?:\d{1,2}|\d{4})(?!\d+))(?:(?:[-_ ]?[ex])(?<episode>\d{1}(?!\d+))))",
+                    RegexOptions.IgnoreCase | RegexOptions.Compiled)
             };