fix: tweak regex for title customFormat token capture to support spaces

src/NzbDrone.Core/Organizer/FileNameBuilder.cs

@@ -47,7 +47,7 @@ namespace NzbDrone.Core.Organizer
         private readonly ICached<bool> _patternHasEpisodeIdentifierCache;
         private readonly Logger _logger;
 
-        private static readonly Regex TitleRegex = new Regex(@"(?<escaped>\{\{|\}\})|\{(?<prefix>[- ._\[(]*)(?<token>(?:[a-z0-9]+)(?:(?<separator>[- ._]+)(?:[a-z0-9]+))?)(?::(?<customFormat>[a-z0-9+-]+(?<!-)))?(?<suffix>[- ._)\]]*)\}",
+        private static readonly Regex TitleRegex = new Regex(@"(?<escaped>\{\{|\}\})|\{(?<prefix>[- ._\[(]*)(?<token>(?:[a-z0-9]+)(?:(?<separator>[- ._]+)(?:[a-z0-9]+))?)(?::(?:[ ]+)?(?<customFormat>[ a-z0-9+-]+(?<!-| )))?(?<suffix>[- ._)\]]*)\}",
                                                              RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.CultureInvariant);
 
         private static readonly Regex EpisodeRegex = new Regex(@"(?<episode>\{episode(?:\:0+)?})",