Fix indexer class lookup by string when name has non-alphanumeric chars

src/Jackett/Indexers/Freshon.cs

@@ -17,7 +17,7 @@ using System.Threading.Tasks;
 using System.Web;
 using System.Web.UI.WebControls;
 
-namespace Jackett
+namespace Jackett.Indexers
 {
     public class Freshon : BaseIndexer, IIndexer
     {

src/Jackett/Jackett.csproj

@@ -197,6 +197,7 @@
     <Compile Include="Models\TorznabQuery.cs" />
     <Compile Include="CurlHelper.cs" />
     <Compile Include="Indexers\AlphaRatio.cs" />
+    <Compile Include="Utils\StringUtil.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="App.config" />

src/Jackett/Services/IndexerManagerService.cs

@@ -1,6 +1,7 @@
 using Autofac;
 using Jackett.Indexers;
 using Jackett.Models;
+using Jackett.Utils;
 using Newtonsoft.Json.Linq;
 using NLog;
 using System;
@@ -52,7 +53,7 @@ namespace Jackett.Services
 
         public IIndexer GetIndexer(string name)
         {
-            var indexer = indexers.Values.Where(i => string.Equals(i.DisplayName, name, StringComparison.InvariantCultureIgnoreCase)).FirstOrDefault();
+            var indexer = indexers.Values.Where(i => string.Equals(StringUtil.StripNonAlphaNumeric(i.DisplayName), name, StringComparison.InvariantCultureIgnoreCase)).FirstOrDefault();
             if (indexer != null)
             {
                 return indexer;

src/Jackett/Utils/StringUtil.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+
+namespace Jackett.Utils
+{
+    public static class StringUtil
+    {
+        public static string StripNonAlphaNumeric(string str)
+        {
+            Regex rgx = new Regex("[^a-zA-Z0-9 -]");
+            str = rgx.Replace(str, "");
+            return str;
+        }
+
+    }
+}