Fixed: File names and release titles lacking a series title and starting with the Air date.

fixes #2825

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

@@ -28,6 +28,8 @@ namespace NzbDrone.Core.Test.ParserTests
         //[TestCase("Corrie.07.01.15", "Corrie", 2015, 1, 7)]
         [TestCase("The Nightly Show with Larry Wilmore 2015 02 09 WEBRIP s01e13", "The Nightly Show with Larry Wilmore", 2015, 2, 9)]
         [TestCase("Jimmy_Fallon_2018_06_22_Seth_Meyers_720p_HEVC_x265-MeGusta", "Jimmy Fallon", 2018, 6, 22)]
+        [TestCase("20161024- Exotic Payback.21x41_720.mkv", "", 2016, 10, 24)]
+        [TestCase("2018-11-14.1080.all.mp4", "", 2018, 11, 14)]
         //[TestCase("", "", 0, 0, 0)]
         public void should_parse_daily_episode(string postTitle, string title, int year, int month, int day)
         {

src/NzbDrone.Core/Parser/Parser.cs

@@ -22,6 +22,10 @@ namespace NzbDrone.Core.Parser
 //                new Regex(@"^(?:(?<absoluteepisode>\d{2,3})(?:_|-|\s|\.)+)+(?<title>.+?)(?:\W|_)+(?:S?(?<season>(?<!\d+)\d{1,2}(?!\d+))(?:(?:\-|[ex]|\W[ex]){1,2}(?<episode>\d{2}(?!\d+)))+)",
 //                          RegexOptions.IgnoreCase | RegexOptions.Compiled),
 
+                //Daily episodes without title (2018-10-12, 20181012) (Strict pattern to avoid false matches)
+                new Regex(@"^(?<airyear>19[6-9]\d|20\d\d)(?<sep>[-]?)(?<airmonth>0\d|1[0-2])\k<sep>(?<airday>[0-2]\d|3[01])(?!\d)",
+                          RegexOptions.IgnoreCase | RegexOptions.Compiled),
+
                 //Multi-Part episodes without a title (S01E05.S01E06)
                 new Regex(@"^(?:\W*S?(?<season>(?<!\d+)(?:\d{1,2}|\d{4})(?!\d+))(?:(?:[ex]){1,2}(?<episode>\d{1,3}(?!\d+)))+){2,}",
                           RegexOptions.IgnoreCase | RegexOptions.Compiled),