Couple more test cases for episode title collapse

src/NzbDrone.Core.Test/OrganizerTests/FileNameBuilderTests/EpisodeTitleCollapseFixture.cs

@@ -68,6 +68,9 @@ namespace NzbDrone.Core.Test.OrganizerTests.FileNameBuilderTests
 
         [TestCase("Hey, Baby, What's Wrong (1)", "Hey, Baby, What's Wrong (2)", "Hey, Baby, What's Wrong")]
         [TestCase("Meet the Guys and Girls of Cycle 20 Part 1", "Meet the Guys and Girls of Cycle 20 Part 2", "Meet the Guys and Girls of Cycle 20")]
+        [TestCase("Meet the Guys and Girls of Cycle 20 Part1", "Meet the Guys and Girls of Cycle 20 Part2", "Meet the Guys and Girls of Cycle 20")]
+        [TestCase("Meet the Guys and Girls of Cycle 20 Part01", "Meet the Guys and Girls of Cycle 20 Part02", "Meet the Guys and Girls of Cycle 20")]
+        [TestCase("Meet the Guys and Girls of Cycle 20 Part 01", "Meet the Guys and Girls of Cycle 20 Part 02", "Meet the Guys and Girls of Cycle 20")]
         [TestCase("Meet the Guys and Girls of Cycle 20 part 1", "Meet the Guys and Girls of Cycle 20 part 2", "Meet the Guys and Girls of Cycle 20")]
         public void should_collapse_episode_titles_when_episode_titles_are_the_same(string title1, string title2, string expected)
         {

src/NzbDrone.Core/Organizer/FileNameBuilder.cs

@@ -59,7 +59,7 @@ namespace NzbDrone.Core.Organizer
         private static readonly Regex ScenifyRemoveChars = new Regex(@"(?<=\s)(,|<|>|\/|\\|;|:|'|""|\||`|~|!|\?|@|$|%|^|\*|-|_|=){1}(?=\s)|('|:|\?|,)(?=(?:(?:s|m)\s)|\s|$)|(\(|\)|\[|\]|\{|\})", RegexOptions.Compiled | RegexOptions.IgnoreCase);
         private static readonly Regex ScenifyReplaceChars = new Regex(@"[\/]", RegexOptions.Compiled | RegexOptions.IgnoreCase);
 
-        private static readonly Regex MultiPartCleanupRegex = new Regex(@"(?:\(\d+\)|Part\s\d+)$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+        private static readonly Regex MultiPartCleanupRegex = new Regex(@"(?:\(\d+\)|Part\s?\d+)$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
 
         private static readonly char[] EpisodeTitleTrimCharacters = new[] { ' ', '.', '?' };