Log replacement regex

src/NzbDrone.Core/Parser/Parser.cs

@@ -561,6 +561,7 @@ namespace NzbDrone.Core.Parser
                 {
                     if (replace.TryReplace(ref releaseTitle))
                     {
+                        Logger.Trace($"Replace regex: {replace}");
                         Logger.Debug("Substituted with " + releaseTitle);
                     }
                 }

src/NzbDrone.Core/Parser/RegexReplace.cs

@@ -42,5 +42,10 @@ namespace NzbDrone.Core.Parser
                 input = _regex.Replace(input, _replacementFormat);
             return result;
         }
+
+        public override string ToString()
+        {
+            return _regex.ToString();
+        }
     }
 }