Some additional release group parsing tests

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

@@ -20,6 +20,10 @@ namespace NzbDrone.Core.Test.ParserTests
         [TestCase("The.Walking.Dead.S04E13.720p.WEB-DL.AAC2.0.H.264-Cyphanix", "Cyphanix")]
         [TestCase("Arrow.S02E01.720p.WEB-DL.DD5.1.H.264.mkv", "DRONE")]
         [TestCase("Series Title S01E01 Episode Title", "DRONE")]
+        [TestCase("The Colbert Report - 2014-06-02 - Thomas Piketty.mkv", "DRONE")]
+        [TestCase("Real Time with Bill Maher S12E17 May 23, 2014.mp4", "DRONE")]
+        [TestCase("Reizen Waes - S01E08 - Transistrië, Zuid-Ossetië en Abchazië SDTV.avi", "DRONE")]
+        [TestCase("Simpsons 10x11 - Wild Barts Cant Be Broken [rl].avi", "DRONE")]
         public void should_parse_release_group(string title, string expected)
         {
             Parser.Parser.ParseReleaseGroup(title).Should().Be(expected);

src/NzbDrone.Core/Parser/Parser.cs

@@ -284,18 +284,22 @@ namespace NzbDrone.Core.Parser
 
             title = title.TrimEnd("-RP");
 
-            string group;
             var matches = ReleaseGroupRegex.Matches(title);
+
             if (matches.Count != 0)
             {
-                group = matches.OfType<Match>().Last().Groups["releasegroup"].Value;
-            }
-            else
-            {
-                return defaultReleaseGroup;
+                var group = matches.OfType<Match>().Last().Groups["releasegroup"].Value;
+                int groupIsNumeric;
+
+                if (Int32.TryParse(group, out groupIsNumeric))
+                {
+                    return defaultReleaseGroup;
+                }
+
+                return group;
             }
 
-            return group;
+            return defaultReleaseGroup;
         }
 
         public static string RemoveFileExtension(string title)