Fixed: Cleaning percent signs from release names

Fixes #1998

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

@@ -134,5 +134,13 @@ namespace NzbDrone.Core.Test.ParserTests
         {
             "Tokyo Ghoul A".CleanSeriesTitle().Should().Be("tokyoghoula");
         }
+
+        [TestCase("3%", "3percent")]
+        [TestCase("Teen Top & 100% Outing Brothers", "teentop100percentoutingbrothers")]
+        [TestCase("Big Jay Oakerson's What's Your F@%king Deal?!", "bigjayoakersonswhatsyourfkingdeal")]
+        public void should_replace_percent_sign_with_percent_following_numbers(string input, string expected)
+        {
+            input.CleanSeriesTitle().Should().Be(expected);
+        }
     }
 }

src/NzbDrone.Core/Parser/Parser.cs

@@ -310,6 +310,8 @@ namespace NzbDrone.Core.Parser
                                                                 string.Empty,
                                                                 RegexOptions.IgnoreCase | RegexOptions.Compiled);
 
+        private static readonly Regex PercentRegex = new Regex(@"(?<=\b\d+)%", RegexOptions.Compiled);
+
         private static readonly Regex FileExtensionRegex = new Regex(@"\.[a-z0-9]{2,4}$",
                                                                 RegexOptions.IgnoreCase | RegexOptions.Compiled);
 
@@ -528,6 +530,9 @@ namespace NzbDrone.Core.Parser
             if (long.TryParse(title, out number))
                 return title;
 
+            // Replace `%` with `percent` to deal with the 3% case
+            title = PercentRegex.Replace(title, "percent");
+
             return NormalizeRegex.Replace(title).ToLower().RemoveAccent();
         }