Fixed: Improved parsing for single digit multi-episode titles

Closes #965

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

@@ -45,6 +45,17 @@ namespace NzbDrone.Core.Test.ParserTests
         [TestCase("RWBY.S01E02E03.1080p.BluRay.x264-DeBTViD", "RWBY", 1, new [] { 2, 3 })]
         [TestCase("grp-zoos01e11e12-1080p", "grp-zoo", 1, new [] { 11, 12 })]
         [TestCase("grp-zoo-s01e11e12-1080p", "grp-zoo", 1, new [] { 11, 12 })]
+        [TestCase("Series Title.S6.E1.E2.Episode Name.1080p.WEB-DL", "Series Title", 6, new [] { 1, 2 })]
+        [TestCase("Series Title.S6E1-E2.Episode Name.1080p.WEB-DL", "Series Title", 6, new [] { 1, 2 })]
+        [TestCase("Series Title.S6E1-S6E2.Episode Name.1080p.WEB-DL", "Series Title", 6, new [] { 1, 2 })]
+        [TestCase("Series Title.S6E1E2.Episode Name.1080p.WEB-DL", "Series Title", 6, new [] { 1, 2 })]
+        [TestCase("Series Title.S6E1-E2-E3.Episode Name.1080p.WEB-DL", "Series Title", 6, new [] { 1, 2, 3})]
+        [TestCase("Series Title.S6.E1E3.Episode Name.1080p.WEB-DL", "Series Title", 6, new [] { 1, 2, 3 })]
+        [TestCase("Series Title.S6.E1-E2.Episode Name.1080p.WEB-DL", "Series Title", 6, new[] { 1, 2 })]
+        [TestCase("Series Title.S6.E1-S6E2.Episode Name.1080p.WEB-DL", "Series Title", 6, new[] { 1, 2 })]
+        [TestCase("Series Title.S6.E1E2.Episode Name.1080p.WEB-DL", "Series Title", 6, new[] { 1, 2 })]
+        [TestCase("Series Title.S6.E1-E2-E3.Episode Name.1080p.WEB-DL", "Series Title", 6, new[] { 1, 2, 3 })]
+        [TestCase("Series Title.S6.E1E3.Episode Name.1080p.WEB-DL", "Series Title", 6, new[] { 1, 2, 3 })]
         //[TestCase("", "", , new [] {  })]
         public void should_parse_multiple_episodes(string postTitle, string title, int season, int[] episodes)
         {

src/NzbDrone.Core/Parser/Parser.cs

@@ -67,7 +67,7 @@ namespace NzbDrone.Core.Parser
                           RegexOptions.IgnoreCase | RegexOptions.Compiled),
 
                 //Multi-episode Repeated (S01E05 - S01E06, 1x05 - 1x06, etc)
-                new Regex(@"^(?<title>.+?)(?:(?:[-_\W](?<![()\[!]))+S?(?<season>(?<!\d+)(?:\d{1,2}|\d{4})(?!\d+))(?:(?:[ex]){1,2}(?<episode>\d{1,3}(?!\d+)))+){2,}",
+                new Regex(@"^(?<title>.+?)(?:(?:[-_\W](?<![()\[!]))+S?(?<season>(?<!\d+)(?:\d{1,2}|\d{4})(?!\d+))(?:(?:[-_. ex]){1,2}(?<episode>\d{1,3}(?!\d+)))+){2,}",
                           RegexOptions.IgnoreCase | RegexOptions.Compiled),
 
                 //Episodes with a title, Single episodes (S01E05, 1x05, etc) & Multi-episode (S01E05E06, S01E05-06, S01E05 E06, etc) **
@@ -86,6 +86,10 @@ namespace NzbDrone.Core.Parser
                 new Regex(@"(?:.*(?:^))(?<title>.*?)(?:\W?|_)S(?<season>(?<!\d+)\d{2}(?!\d+))(?:E(?<episode>(?<!\d+)\d{2}(?!\d+)))+",
                           RegexOptions.IgnoreCase | RegexOptions.Compiled),
 
+                //Multi-episode with single episode numbers (S6.E1-E2, S6.E1E2, S6E1E2, etc)
+                new Regex(@"^(?<title>.+?)[-_. ]S(?<season>(?<!\d+)(?:\d{1,2}|\d{4})(?!\d+))(?:[-_. ]?[ex]?(?<episode>(?<!\d+)\d{1,2}(?!\d+)))+",
+                          RegexOptions.IgnoreCase | RegexOptions.Compiled),
+
                 //Single episode season or episode S1E1 or S1-E1
                 new Regex(@"(?:.*(?:\""|^))(?<title>.*?)(?:\W?|_)S(?<season>(?<!\d+)\d{1,2}(?!\d+))(?:\W|_)?E(?<episode>(?<!\d+)\d{1,2}(?!\d+))",
                           RegexOptions.IgnoreCase | RegexOptions.Compiled),