Fixed: Parsing similar artist names with common words at end

(cherry picked from commit 0fe24539625f8397dfb63d4618611db99c3c137a)

Closes #2064

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

@@ -35,16 +35,13 @@ public void should_remove_special_characters_and_casing(string dirty, string cle
         [TestCase("or")]
         [TestCase("an")]
         [TestCase("of")]
-        public void should_remove_common_words(string word)
+        public void should_remove_common_words_from_middle_of_title(string word)
         {
             var dirtyFormat = new[]
                             {
                                 "word.{0}.word",
                                 "word {0} word",
-                                "word-{0}-word",
-                                "word.word.{0}",
-                                "word-word-{0}",
-                                "word-word {0}",
+                                "word-{0}-word"
                             };
 
             foreach (var s in dirtyFormat)
@@ -54,6 +51,27 @@ public void should_remove_common_words(string word)
             }
         }
 
+        [TestCase("the")]
+        [TestCase("and")]
+        [TestCase("or")]
+        [TestCase("an")]
+        [TestCase("of")]
+        public void should_not_remove_common_words_from_end_of_title(string word)
+        {
+            var dirtyFormat = new[]
+                              {
+                                  "word.word.{0}",
+                                  "word-word-{0}",
+                                  "word-word {0}"
+                              };
+
+            foreach (var s in dirtyFormat)
+            {
+                var dirty = string.Format(s, word);
+                dirty.CleanArtistName().Should().Be("wordword" + word.ToLower());
+            }
+        }
+
         [Test]
         public void should_remove_a_from_middle_of_title()
         {

src/NzbDrone.Core/Parser/Parser.cs

@@ -154,7 +154,7 @@ public static class Parser
                 new Regex(@"^b00bs$", RegexOptions.Compiled | RegexOptions.IgnoreCase)
             };
 
-        private static readonly RegexReplace NormalizeRegex = new RegexReplace(@"((?:\b|_)(?<!^)(a(?!$)|an|the|and|or|of)(?:\b|_))|\W|_",
+        private static readonly RegexReplace NormalizeRegex = new RegexReplace(@"((?:\b|_)(?<!^)(a(?!$)|an|the|and|or|of)(?!$)(?:\b|_))|\W|_",
                                                                 string.Empty,
                                                                 RegexOptions.IgnoreCase | RegexOptions.Compiled);