diff --git a/src/Squidex/Config/MyUIOptions.cs b/src/Squidex/Config/MyUIOptions.cs
new file mode 100644
index 000000000..f95e5c24b
--- /dev/null
+++ b/src/Squidex/Config/MyUIOptions.cs
@@ -0,0 +1,17 @@
+// ==========================================================================
+//  MyUIOptions.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System.Collections.Generic;
+
+namespace Squidex.Config
+{
+    public sealed class MyUIOptions
+    {
+        public Dictionary<string, string> RegexSuggestions { get; set; }
+    }
+}
diff --git a/src/Squidex/Controllers/Api/Apps/AppClientsController.cs b/src/Squidex/Controllers/Api/Apps/AppClientsController.cs
index d80d78453..98364fc35 100644
--- a/src/Squidex/Controllers/Api/Apps/AppClientsController.cs
+++ b/src/Squidex/Controllers/Api/Apps/AppClientsController.cs
@@ -26,7 +26,7 @@ namespace Squidex.Controllers.Api.Apps
     [ApiExceptionFilter]
     [AppApi]
     [SwaggerTag("Apps")]
-    public class AppClientsController : ControllerBase
+    public sealed class AppClientsController : ControllerBase
     {
         public AppClientsController(ICommandBus commandBus)
             : base(commandBus)
diff --git a/src/Squidex/Controllers/Api/Apps/AppContributorsController.cs b/src/Squidex/Controllers/Api/Apps/AppContributorsController.cs
index 7dd87c4ba..e7c1251b8 100644
--- a/src/Squidex/Controllers/Api/Apps/AppContributorsController.cs
+++ b/src/Squidex/Controllers/Api/Apps/AppContributorsController.cs
@@ -27,7 +27,7 @@ namespace Squidex.Controllers.Api.Apps
     [ApiExceptionFilter]
     [AppApi]
     [SwaggerTag("Apps")]
-    public class AppContributorsController : ControllerBase
+    public sealed class AppContributorsController : ControllerBase
     {
         private readonly IAppPlansProvider appPlansProvider;
 
diff --git a/src/Squidex/Controllers/Api/Apps/AppLanguagesController.cs b/src/Squidex/Controllers/Api/Apps/AppLanguagesController.cs
index 379c3af78..86c5b7d01 100644
--- a/src/Squidex/Controllers/Api/Apps/AppLanguagesController.cs
+++ b/src/Squidex/Controllers/Api/Apps/AppLanguagesController.cs
@@ -29,7 +29,7 @@ namespace Squidex.Controllers.Api.Apps
     [ApiExceptionFilter]
     [AppApi]
     [SwaggerTag("Apps")]
-    public class AppLanguagesController : ControllerBase
+    public sealed class AppLanguagesController : ControllerBase
     {
         public AppLanguagesController(ICommandBus commandBus)
             : base(commandBus)
diff --git a/src/Squidex/Controllers/Api/Apps/AppsController.cs b/src/Squidex/Controllers/Api/Apps/AppsController.cs
index 517a40700..5fdf1c88c 100644
--- a/src/Squidex/Controllers/Api/Apps/AppsController.cs
+++ b/src/Squidex/Controllers/Api/Apps/AppsController.cs
@@ -28,7 +28,7 @@ namespace Squidex.Controllers.Api.Apps
     [Authorize]
     [ApiExceptionFilter]
     [SwaggerTag("Apps")]
-    public class AppsController : ControllerBase
+    public sealed class AppsController : ControllerBase
     {
         private readonly IAppRepository appRepository;
 
diff --git a/src/Squidex/Controllers/Api/Apps/Models/AddAppLanguageDto.cs b/src/Squidex/Controllers/Api/Apps/Models/AddAppLanguageDto.cs
index 60f59a825..d604c8aac 100644
--- a/src/Squidex/Controllers/Api/Apps/Models/AddAppLanguageDto.cs
+++ b/src/Squidex/Controllers/Api/Apps/Models/AddAppLanguageDto.cs
@@ -11,7 +11,7 @@ using Squidex.Infrastructure;
 
 namespace Squidex.Controllers.Api.Apps.Models
 {
-    public class AddAppLanguageDto
+    public sealed class AddAppLanguageDto
     {
         /// <summary>
         /// The language to add.
diff --git a/src/Squidex/Controllers/Api/Apps/Models/AppLanguageDto.cs b/src/Squidex/Controllers/Api/Apps/Models/AppLanguageDto.cs
index b194cd01b..40ff4771c 100644
--- a/src/Squidex/Controllers/Api/Apps/Models/AppLanguageDto.cs
+++ b/src/Squidex/Controllers/Api/Apps/Models/AppLanguageDto.cs
@@ -12,7 +12,7 @@ using Squidex.Infrastructure;
 
 namespace Squidex.Controllers.Api.Apps.Models
 {
-    public class AppLanguageDto
+    public sealed class AppLanguageDto
     {
         /// <summary>
         /// The iso code of the language.
diff --git a/src/Squidex/Controllers/Api/Apps/Models/ClientDto.cs b/src/Squidex/Controllers/Api/Apps/Models/ClientDto.cs
index 6fe81cf72..efe437699 100644
--- a/src/Squidex/Controllers/Api/Apps/Models/ClientDto.cs
+++ b/src/Squidex/Controllers/Api/Apps/Models/ClientDto.cs
@@ -10,7 +10,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Squidex.Controllers.Api.Apps.Models
 {
-    public class ClientDto
+    public sealed class ClientDto
     {
         /// <summary>
         /// The client id.
diff --git a/src/Squidex/Controllers/Api/Apps/Models/ContributorsDto.cs b/src/Squidex/Controllers/Api/Apps/Models/ContributorsDto.cs
index 96769079b..cd542674b 100644
--- a/src/Squidex/Controllers/Api/Apps/Models/ContributorsDto.cs
+++ b/src/Squidex/Controllers/Api/Apps/Models/ContributorsDto.cs
@@ -10,7 +10,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Squidex.Controllers.Api.Apps.Models
 {
-    public class ContributorsDto
+    public sealed class ContributorsDto
     {
         /// <summary>
         /// The contributors.
diff --git a/src/Squidex/Controllers/Api/Apps/Models/UpdateAppClientDto.cs b/src/Squidex/Controllers/Api/Apps/Models/UpdateAppClientDto.cs
index 3eb7cee0e..13d20bf25 100644
--- a/src/Squidex/Controllers/Api/Apps/Models/UpdateAppClientDto.cs
+++ b/src/Squidex/Controllers/Api/Apps/Models/UpdateAppClientDto.cs
@@ -10,7 +10,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Squidex.Controllers.Api.Apps.Models
 {
-    public class UpdateAppClientDto
+    public sealed class UpdateAppClientDto
     {
         /// <summary>
         /// The new display name of the client.
diff --git a/src/Squidex/Controllers/Api/Apps/Models/UpdateAppLanguageDto.cs b/src/Squidex/Controllers/Api/Apps/Models/UpdateAppLanguageDto.cs
index 94368f040..d2d21cc52 100644
--- a/src/Squidex/Controllers/Api/Apps/Models/UpdateAppLanguageDto.cs
+++ b/src/Squidex/Controllers/Api/Apps/Models/UpdateAppLanguageDto.cs
@@ -11,7 +11,7 @@ using Squidex.Infrastructure;
 
 namespace Squidex.Controllers.Api.Apps.Models
 {
-    public class UpdateAppLanguageDto
+    public sealed class UpdateAppLanguageDto
     {
         /// <summary>
         /// Set the value to true to make the language the master.
diff --git a/src/Squidex/Controllers/Api/Assets/AssetContentController.cs b/src/Squidex/Controllers/Api/Assets/AssetContentController.cs
index 0415ab079..088ec9b6f 100644
--- a/src/Squidex/Controllers/Api/Assets/AssetContentController.cs
+++ b/src/Squidex/Controllers/Api/Assets/AssetContentController.cs
@@ -26,7 +26,7 @@ namespace Squidex.Controllers.Api.Assets
     [ApiExceptionFilter]
     [AppApi]
     [SwaggerTag("Assets")]
-    public class AssetContentController : ControllerBase
+    public sealed class AssetContentController : ControllerBase
     {
         private readonly IAssetStore assetStorage;
         private readonly IAssetRepository assetRepository;
diff --git a/src/Squidex/Controllers/Api/Assets/AssetsController.cs b/src/Squidex/Controllers/Api/Assets/AssetsController.cs
index 2ffec457d..245ab471b 100644
--- a/src/Squidex/Controllers/Api/Assets/AssetsController.cs
+++ b/src/Squidex/Controllers/Api/Assets/AssetsController.cs
@@ -36,7 +36,7 @@ namespace Squidex.Controllers.Api.Assets
     [ApiExceptionFilter]
     [AppApi]
     [SwaggerTag("Assets")]
-    public class AssetsController : ControllerBase
+    public sealed class AssetsController : ControllerBase
     {
         private readonly IAssetRepository assetRepository;
         private readonly IAssetStatsRepository assetStatsRepository;
diff --git a/src/Squidex/Controllers/Api/Assets/Models/AssetUpdateDto.cs b/src/Squidex/Controllers/Api/Assets/Models/AssetUpdateDto.cs
index f93891d28..53b84ce34 100644
--- a/src/Squidex/Controllers/Api/Assets/Models/AssetUpdateDto.cs
+++ b/src/Squidex/Controllers/Api/Assets/Models/AssetUpdateDto.cs
@@ -10,7 +10,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Squidex.Controllers.Api.Assets.Models
 {
-    public class AssetUpdateDto
+    public sealed class AssetUpdateDto
     {
         /// <summary>
         /// The new name of the asset.
diff --git a/src/Squidex/Controllers/Api/EntityCreatedDto.cs b/src/Squidex/Controllers/Api/EntityCreatedDto.cs
index 65297c183..b60d8dbb4 100644
--- a/src/Squidex/Controllers/Api/EntityCreatedDto.cs
+++ b/src/Squidex/Controllers/Api/EntityCreatedDto.cs
@@ -10,7 +10,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Squidex.Controllers.Api
 {
-    public class EntityCreatedDto
+    public sealed class EntityCreatedDto
     {
         /// <summary>
         /// Id of the created entity.
diff --git a/src/Squidex/Controllers/Api/History/HistoryController.cs b/src/Squidex/Controllers/Api/History/HistoryController.cs
index a9ae4c65f..f7f2a2781 100644
--- a/src/Squidex/Controllers/Api/History/HistoryController.cs
+++ b/src/Squidex/Controllers/Api/History/HistoryController.cs
@@ -25,7 +25,7 @@ namespace Squidex.Controllers.Api.History
     [ApiExceptionFilter]
     [AppApi]
     [SwaggerTag("History")]
-    public class HistoryController : ControllerBase
+    public sealed class HistoryController : ControllerBase
     {
         private readonly IHistoryEventRepository historyEventRepository;
 
diff --git a/src/Squidex/Controllers/Api/History/Models/HistoryEventDto.cs b/src/Squidex/Controllers/Api/History/Models/HistoryEventDto.cs
index 7fb20900e..4eff213d3 100644
--- a/src/Squidex/Controllers/Api/History/Models/HistoryEventDto.cs
+++ b/src/Squidex/Controllers/Api/History/Models/HistoryEventDto.cs
@@ -12,7 +12,7 @@ using NodaTime;
 
 namespace Squidex.Controllers.Api.History.Models
 {
-    public class HistoryEventDto
+    public sealed class HistoryEventDto
     {
         /// <summary>
         /// The message of the event.
diff --git a/src/Squidex/Controllers/Api/LanguageDto.cs b/src/Squidex/Controllers/Api/LanguageDto.cs
index 11304fad3..30f9b56a4 100644
--- a/src/Squidex/Controllers/Api/LanguageDto.cs
+++ b/src/Squidex/Controllers/Api/LanguageDto.cs
@@ -10,7 +10,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Squidex.Controllers.Api
 {
-    public class LanguageDto
+    public sealed class LanguageDto
     {
         /// <summary>
         /// The iso code of the language.
diff --git a/src/Squidex/Controllers/Api/Languages/LanguagesController.cs b/src/Squidex/Controllers/Api/Languages/LanguagesController.cs
index 83d68afdb..610c22a1b 100644
--- a/src/Squidex/Controllers/Api/Languages/LanguagesController.cs
+++ b/src/Squidex/Controllers/Api/Languages/LanguagesController.cs
@@ -22,7 +22,7 @@ namespace Squidex.Controllers.Api.Languages
     [Authorize]
     [ApiExceptionFilter]
     [SwaggerTag("Languages")]
-    public class LanguagesController : Controller
+    public sealed class LanguagesController : Controller
     {
         /// <summary>
         /// Get supported languages.
diff --git a/src/Squidex/Controllers/Api/Ping/PingController.cs b/src/Squidex/Controllers/Api/Ping/PingController.cs
index 4529669c3..01fb8f789 100644
--- a/src/Squidex/Controllers/Api/Ping/PingController.cs
+++ b/src/Squidex/Controllers/Api/Ping/PingController.cs
@@ -19,7 +19,7 @@ namespace Squidex.Controllers.Api.Ping
     [ApiExceptionFilter]
     [AppApi]
     [SwaggerTag("Ping")]
-    public class PingController : Controller
+    public sealed class PingController : Controller
     {
         /// <summary>
         /// Get ping status.
diff --git a/src/Squidex/Controllers/Api/Plans/AppPlansController.cs b/src/Squidex/Controllers/Api/Plans/AppPlansController.cs
index 9e3ae931d..6df93786c 100644
--- a/src/Squidex/Controllers/Api/Plans/AppPlansController.cs
+++ b/src/Squidex/Controllers/Api/Plans/AppPlansController.cs
@@ -28,7 +28,7 @@ namespace Squidex.Controllers.Api.Plans
     [ApiExceptionFilter]
     [AppApi]
     [SwaggerTag("Plans")]
-    public class AppPlansController : ControllerBase
+    public sealed class AppPlansController : ControllerBase
     {
         private readonly IAppPlansProvider appPlansProvider;
         private readonly IAppPlanBillingManager appPlansBillingManager;
diff --git a/src/Squidex/Controllers/Api/Plans/Models/AppPlansDto.cs b/src/Squidex/Controllers/Api/Plans/Models/AppPlansDto.cs
index 92031bd9b..a44c341fe 100644
--- a/src/Squidex/Controllers/Api/Plans/Models/AppPlansDto.cs
+++ b/src/Squidex/Controllers/Api/Plans/Models/AppPlansDto.cs
@@ -10,7 +10,7 @@ using System.Collections.Generic;
 
 namespace Squidex.Controllers.Api.Plans.Models
 {
-    public class AppPlansDto
+    public sealed class AppPlansDto
     {
         /// <summary>
         /// The available plans.
diff --git a/src/Squidex/Controllers/Api/Plans/Models/ChangePlanDto.cs b/src/Squidex/Controllers/Api/Plans/Models/ChangePlanDto.cs
index 9b2d6cb79..5daadd6d8 100644
--- a/src/Squidex/Controllers/Api/Plans/Models/ChangePlanDto.cs
+++ b/src/Squidex/Controllers/Api/Plans/Models/ChangePlanDto.cs
@@ -10,7 +10,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Squidex.Controllers.Api.Plans.Models
 {
-    public class ChangePlanDto
+    public sealed class ChangePlanDto
     {
         /// <summary>
         /// The new plan id.
diff --git a/src/Squidex/Controllers/Api/Plans/Models/PlanChangedDto.cs b/src/Squidex/Controllers/Api/Plans/Models/PlanChangedDto.cs
index 3674351dc..afb56d754 100644
--- a/src/Squidex/Controllers/Api/Plans/Models/PlanChangedDto.cs
+++ b/src/Squidex/Controllers/Api/Plans/Models/PlanChangedDto.cs
@@ -8,7 +8,7 @@
 
 namespace Squidex.Controllers.Api.Plans.Models
 {
-    public class PlanChangedDto
+    public sealed class PlanChangedDto
     {
         /// <summary>
         /// Optional redirect uri.
diff --git a/src/Squidex/Controllers/Api/Plans/Models/PlanDto.cs b/src/Squidex/Controllers/Api/Plans/Models/PlanDto.cs
index 30c1191f9..0c45639ea 100644
--- a/src/Squidex/Controllers/Api/Plans/Models/PlanDto.cs
+++ b/src/Squidex/Controllers/Api/Plans/Models/PlanDto.cs
@@ -8,7 +8,7 @@
 
 namespace Squidex.Controllers.Api.Plans.Models
 {
-    public class PlanDto
+    public sealed class PlanDto
     {
         /// <summary>
         /// The id of the plan.
diff --git a/src/Squidex/Controllers/Api/Schemas/Models/ReorderFieldsDto.cs b/src/Squidex/Controllers/Api/Schemas/Models/ReorderFieldsDto.cs
index b4e2ab89e..ae7cd21be 100644
--- a/src/Squidex/Controllers/Api/Schemas/Models/ReorderFieldsDto.cs
+++ b/src/Squidex/Controllers/Api/Schemas/Models/ReorderFieldsDto.cs
@@ -11,7 +11,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Squidex.Controllers.Api.Schemas.Models
 {
-    public class ReorderFieldsDto
+    public sealed class ReorderFieldsDto
     {
         /// <summary>
         /// The field ids in the target order.
diff --git a/src/Squidex/Controllers/Api/Schemas/Models/SchemaDto.cs b/src/Squidex/Controllers/Api/Schemas/Models/SchemaDto.cs
index 0a92da355..1d6cf78e2 100644
--- a/src/Squidex/Controllers/Api/Schemas/Models/SchemaDto.cs
+++ b/src/Squidex/Controllers/Api/Schemas/Models/SchemaDto.cs
@@ -13,7 +13,7 @@ using Squidex.Infrastructure;
 
 namespace Squidex.Controllers.Api.Schemas.Models
 {
-    public class SchemaDto
+    public sealed class SchemaDto
     {
         /// <summary>
         /// The id of the schema.
diff --git a/src/Squidex/Controllers/Api/Schemas/Models/SchemaPropertiesDto.cs b/src/Squidex/Controllers/Api/Schemas/Models/SchemaPropertiesDto.cs
index e36928c49..822c6f12b 100644
--- a/src/Squidex/Controllers/Api/Schemas/Models/SchemaPropertiesDto.cs
+++ b/src/Squidex/Controllers/Api/Schemas/Models/SchemaPropertiesDto.cs
@@ -10,7 +10,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Squidex.Controllers.Api.Schemas.Models
 {
-    public class SchemaPropertiesDto
+    public sealed class SchemaPropertiesDto
     {
         /// <summary>
         /// Optional label for the editor.
diff --git a/src/Squidex/Controllers/Api/Schemas/Models/UpdateFieldDto.cs b/src/Squidex/Controllers/Api/Schemas/Models/UpdateFieldDto.cs
index d2df340c6..6ec10e43c 100644
--- a/src/Squidex/Controllers/Api/Schemas/Models/UpdateFieldDto.cs
+++ b/src/Squidex/Controllers/Api/Schemas/Models/UpdateFieldDto.cs
@@ -10,7 +10,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Squidex.Controllers.Api.Schemas.Models
 {
-    public class UpdateFieldDto
+    public sealed class UpdateFieldDto
     {
         /// <summary>
         /// The field properties.
diff --git a/src/Squidex/Controllers/Api/Schemas/Models/UpdateSchemaDto.cs b/src/Squidex/Controllers/Api/Schemas/Models/UpdateSchemaDto.cs
index 07919d47b..6c3ea84ed 100644
--- a/src/Squidex/Controllers/Api/Schemas/Models/UpdateSchemaDto.cs
+++ b/src/Squidex/Controllers/Api/Schemas/Models/UpdateSchemaDto.cs
@@ -10,7 +10,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Squidex.Controllers.Api.Schemas.Models
 {
-    public class UpdateSchemaDto
+    public sealed class UpdateSchemaDto
     {
         /// <summary>
         /// Optional label for the editor.
diff --git a/src/Squidex/Controllers/Api/Schemas/SchemaFieldsController.cs b/src/Squidex/Controllers/Api/Schemas/SchemaFieldsController.cs
index 4449d0627..386f1005e 100644
--- a/src/Squidex/Controllers/Api/Schemas/SchemaFieldsController.cs
+++ b/src/Squidex/Controllers/Api/Schemas/SchemaFieldsController.cs
@@ -23,7 +23,7 @@ namespace Squidex.Controllers.Api.Schemas
     [ApiExceptionFilter]
     [AppApi]
     [SwaggerTag("Schemas")]
-    public class SchemaFieldsController : ControllerBase
+    public sealed class SchemaFieldsController : ControllerBase
     {
         public SchemaFieldsController(ICommandBus commandBus)
             : base(commandBus)
diff --git a/src/Squidex/Controllers/Api/Schemas/SchemasController.cs b/src/Squidex/Controllers/Api/Schemas/SchemasController.cs
index 3f9a8c822..8174fd9ec 100644
--- a/src/Squidex/Controllers/Api/Schemas/SchemasController.cs
+++ b/src/Squidex/Controllers/Api/Schemas/SchemasController.cs
@@ -30,7 +30,7 @@ namespace Squidex.Controllers.Api.Schemas
     [ApiExceptionFilter]
     [AppApi]
     [SwaggerTag("Schemas")]
-    public class SchemasController : ControllerBase
+    public sealed class SchemasController : ControllerBase
     {
         private readonly ISchemaRepository schemaRepository;
 
diff --git a/src/Squidex/Controllers/Api/Statistics/Models/CallsUsageDto.cs b/src/Squidex/Controllers/Api/Statistics/Models/CallsUsageDto.cs
index 17b0c632c..99ff2038d 100644
--- a/src/Squidex/Controllers/Api/Statistics/Models/CallsUsageDto.cs
+++ b/src/Squidex/Controllers/Api/Statistics/Models/CallsUsageDto.cs
@@ -10,7 +10,7 @@ using System;
 
 namespace Squidex.Controllers.Api.Statistics.Models
 {
-    public class CallsUsageDto
+    public sealed class CallsUsageDto
     {
         /// <summary>
         /// The date when the usage was tracked.
diff --git a/src/Squidex/Controllers/Api/Statistics/Models/CurrentCallsDto.cs b/src/Squidex/Controllers/Api/Statistics/Models/CurrentCallsDto.cs
index 7082bf5d8..19d797079 100644
--- a/src/Squidex/Controllers/Api/Statistics/Models/CurrentCallsDto.cs
+++ b/src/Squidex/Controllers/Api/Statistics/Models/CurrentCallsDto.cs
@@ -8,7 +8,7 @@
 
 namespace Squidex.Controllers.Api.Statistics.Models
 {
-    public class CurrentCallsDto
+    public sealed class CurrentCallsDto
     {
         /// <summary>
         /// The number of calls.
diff --git a/src/Squidex/Controllers/Api/Statistics/Models/CurrentStorageDto.cs b/src/Squidex/Controllers/Api/Statistics/Models/CurrentStorageDto.cs
index 85f5e91d9..30d59396f 100644
--- a/src/Squidex/Controllers/Api/Statistics/Models/CurrentStorageDto.cs
+++ b/src/Squidex/Controllers/Api/Statistics/Models/CurrentStorageDto.cs
@@ -8,7 +8,7 @@
 
 namespace Squidex.Controllers.Api.Statistics.Models
 {
-    public class CurrentStorageDto
+    public sealed class CurrentStorageDto
     {
         /// <summary>
         /// The size in bytes.
diff --git a/src/Squidex/Controllers/Api/Statistics/Models/StorageUsageDto.cs b/src/Squidex/Controllers/Api/Statistics/Models/StorageUsageDto.cs
index 5da3a4f05..a03eef402 100644
--- a/src/Squidex/Controllers/Api/Statistics/Models/StorageUsageDto.cs
+++ b/src/Squidex/Controllers/Api/Statistics/Models/StorageUsageDto.cs
@@ -10,7 +10,7 @@ using System;
 
 namespace Squidex.Controllers.Api.Statistics.Models
 {
-    public class StorageUsageDto
+    public sealed class StorageUsageDto
     {
         /// <summary>
         /// The date when the usage was tracked.
diff --git a/src/Squidex/Controllers/Api/Statistics/UsagesController.cs b/src/Squidex/Controllers/Api/Statistics/UsagesController.cs
index 9fcbd3411..b36837b2a 100644
--- a/src/Squidex/Controllers/Api/Statistics/UsagesController.cs
+++ b/src/Squidex/Controllers/Api/Statistics/UsagesController.cs
@@ -27,7 +27,7 @@ namespace Squidex.Controllers.Api.Statistics
     [ApiExceptionFilter]
     [AppApi]
     [SwaggerTag("Statistics")]
-    public class UsagesController : ControllerBase
+    public sealed class UsagesController : ControllerBase
     {
         private readonly IUsageTracker usageTracker;
         private readonly IAppPlansProvider appPlanProvider;
diff --git a/src/Squidex/Controllers/Api/UI/Models/UIRegexSuggestionDto.cs b/src/Squidex/Controllers/Api/UI/Models/UIRegexSuggestionDto.cs
new file mode 100644
index 000000000..cd47f6fd1
--- /dev/null
+++ b/src/Squidex/Controllers/Api/UI/Models/UIRegexSuggestionDto.cs
@@ -0,0 +1,27 @@
+// ==========================================================================
+//  UIRegexSuggestionDto.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System.ComponentModel.DataAnnotations;
+
+namespace Squidex.Controllers.Api.UI.Models
+{
+    public sealed class UIRegexSuggestionDto
+    {
+        /// <summary>
+        /// The name of the suggestion.
+        /// </summary>
+        [Required]
+        public string Name { get; set; }
+
+        /// <summary>
+        /// The regex pattern.
+        /// </summary>
+        [Required]
+        public string Pattern { get; set; }
+    }
+}
diff --git a/src/Squidex/Controllers/Api/UI/Models/UISettingsDto.cs b/src/Squidex/Controllers/Api/UI/Models/UISettingsDto.cs
new file mode 100644
index 000000000..73df39d84
--- /dev/null
+++ b/src/Squidex/Controllers/Api/UI/Models/UISettingsDto.cs
@@ -0,0 +1,22 @@
+// ==========================================================================
+//  UISettingsDto.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+
+namespace Squidex.Controllers.Api.UI.Models
+{
+    public sealed class UISettingsDto
+    {
+        /// <summary>
+        /// The regex suggestions.
+        /// </summary>
+        [Required]
+        public List<UIRegexSuggestionDto> RegexSuggestions { get; set; }
+    }
+}
diff --git a/src/Squidex/Controllers/Api/UI/UIController.cs b/src/Squidex/Controllers/Api/UI/UIController.cs
new file mode 100644
index 000000000..6fd8a28f3
--- /dev/null
+++ b/src/Squidex/Controllers/Api/UI/UIController.cs
@@ -0,0 +1,57 @@
+// ==========================================================================
+//  UIController.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System.Collections.Generic;
+using System.Linq;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Options;
+using NSwag.Annotations;
+using Squidex.Config;
+using Squidex.Controllers.Api.UI.Models;
+using Squidex.Pipeline;
+
+namespace Squidex.Controllers.Api.UI
+{
+    /// <summary>
+    /// Manages ui settings and configs.
+    /// </summary>
+    [ApiExceptionFilter]
+    [SwaggerTag("UI")]
+    public sealed class UIController : Controller
+    {
+        private readonly MyUIOptions uiOptions;
+
+        public UIController(IOptions<MyUIOptions> uiOptions)
+        {
+            this.uiOptions = uiOptions.Value;
+        }
+
+        /// <summary>
+        /// Get ui settings.
+        /// </summary>
+        [HttpGet]
+        [Route("ui/settings/")]
+        [ProducesResponseType(typeof(UISettingsDto), 200)]
+        [ApiCosts(0)]
+        public IActionResult GetSettings()
+        {
+            var dto = new UISettingsDto
+            {
+                RegexSuggestions =
+                    uiOptions?.RegexSuggestions.Where(x =>
+                            !string.IsNullOrWhiteSpace(x.Key) &&
+                            !string.IsNullOrWhiteSpace(x.Value))
+                        .Select(x => new UIRegexSuggestionDto { Name = x.Key, Pattern = x.Value })
+                        .ToList()
+                    ?? new List<UIRegexSuggestionDto>()
+            };
+
+            return Ok(dto);
+        }
+    }
+}
diff --git a/src/Squidex/Controllers/Api/Users/Models/UserCreatedDto.cs b/src/Squidex/Controllers/Api/Users/Models/UserCreatedDto.cs
index 324e202f1..3e84a714c 100644
--- a/src/Squidex/Controllers/Api/Users/Models/UserCreatedDto.cs
+++ b/src/Squidex/Controllers/Api/Users/Models/UserCreatedDto.cs
@@ -10,7 +10,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Squidex.Controllers.Api.Users.Models
 {
-    public class UserCreatedDto
+    public sealed class UserCreatedDto
     {
         [Required]
         public string Id { get; set; }
diff --git a/src/Squidex/Controllers/Api/Users/Models/UsersDto.cs b/src/Squidex/Controllers/Api/Users/Models/UsersDto.cs
index fc0ca93fd..919150480 100644
--- a/src/Squidex/Controllers/Api/Users/Models/UsersDto.cs
+++ b/src/Squidex/Controllers/Api/Users/Models/UsersDto.cs
@@ -8,7 +8,7 @@
 
 namespace Squidex.Controllers.Api.Users.Models
 {
-    public class UsersDto
+    public sealed class UsersDto
     {
         /// <summary>
         /// The total number of users.
diff --git a/src/Squidex/Controllers/Api/Users/UserManagementController.cs b/src/Squidex/Controllers/Api/Users/UserManagementController.cs
index 4774350c0..1b5c2d11c 100644
--- a/src/Squidex/Controllers/Api/Users/UserManagementController.cs
+++ b/src/Squidex/Controllers/Api/Users/UserManagementController.cs
@@ -25,7 +25,7 @@ namespace Squidex.Controllers.Api.Users
     [MustBeAdministrator]
     [ApiExceptionFilter]
     [SwaggerIgnore]
-    public class UserManagementController : Controller
+    public sealed class UserManagementController : Controller
     {
         private readonly UserManager<IUser> userManager;
         private readonly IUserFactory userFactory;
diff --git a/src/Squidex/Controllers/Api/Users/UsersController.cs b/src/Squidex/Controllers/Api/Users/UsersController.cs
index fbc5ddba2..4f6bc080d 100644
--- a/src/Squidex/Controllers/Api/Users/UsersController.cs
+++ b/src/Squidex/Controllers/Api/Users/UsersController.cs
@@ -30,7 +30,7 @@ namespace Squidex.Controllers.Api.Users
     /// </summary>
     [ApiExceptionFilter]
     [SwaggerTag("Users")]
-    public class UsersController : Controller
+    public sealed class UsersController : Controller
     {
         private static readonly byte[] AvatarBytes;
         private readonly UserManager<IUser> userManager;
diff --git a/src/Squidex/Controllers/Api/Webhooks/Models/CreateWebhookDto.cs b/src/Squidex/Controllers/Api/Webhooks/Models/CreateWebhookDto.cs
index fca6289f7..56ef402f4 100644
--- a/src/Squidex/Controllers/Api/Webhooks/Models/CreateWebhookDto.cs
+++ b/src/Squidex/Controllers/Api/Webhooks/Models/CreateWebhookDto.cs
@@ -14,7 +14,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Squidex.Controllers.Api.Webhooks.Models
 {
-    public class CreateWebhookDto
+    public sealed class CreateWebhookDto
     {
         /// <summary>
         /// The url of the webhook.
diff --git a/src/Squidex/Controllers/Api/Webhooks/Models/UpdateWebhookDto.cs b/src/Squidex/Controllers/Api/Webhooks/Models/UpdateWebhookDto.cs
index 684600a18..d5b7da231 100644
--- a/src/Squidex/Controllers/Api/Webhooks/Models/UpdateWebhookDto.cs
+++ b/src/Squidex/Controllers/Api/Webhooks/Models/UpdateWebhookDto.cs
@@ -12,7 +12,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Squidex.Controllers.Api.Webhooks.Models
 {
-    public class UpdateWebhookDto
+    public sealed class UpdateWebhookDto
     {
         /// <summary>
         /// The url of the webhook.
diff --git a/src/Squidex/Controllers/Api/Webhooks/Models/WebhookCreatedDto.cs b/src/Squidex/Controllers/Api/Webhooks/Models/WebhookCreatedDto.cs
index 7b04c9f0e..f00234562 100644
--- a/src/Squidex/Controllers/Api/Webhooks/Models/WebhookCreatedDto.cs
+++ b/src/Squidex/Controllers/Api/Webhooks/Models/WebhookCreatedDto.cs
@@ -11,7 +11,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Squidex.Controllers.Api.Webhooks.Models
 {
-    public class WebhookCreatedDto
+    public sealed class WebhookCreatedDto
     {
         /// <summary>
         /// The id of the webhook.
diff --git a/src/Squidex/Controllers/Api/Webhooks/Models/WebhookDto.cs b/src/Squidex/Controllers/Api/Webhooks/Models/WebhookDto.cs
index f2801d9b1..f6a90e7a7 100644
--- a/src/Squidex/Controllers/Api/Webhooks/Models/WebhookDto.cs
+++ b/src/Squidex/Controllers/Api/Webhooks/Models/WebhookDto.cs
@@ -14,7 +14,7 @@ using System.Collections.Generic;
 
 namespace Squidex.Controllers.Api.Webhooks.Models
 {
-    public class WebhookDto
+    public sealed class WebhookDto
     {
         /// <summary>
         /// The id of the webhook.
diff --git a/src/Squidex/Controllers/Api/Webhooks/Models/WebhookEventDto.cs b/src/Squidex/Controllers/Api/Webhooks/Models/WebhookEventDto.cs
index 21a721c71..4473fe749 100644
--- a/src/Squidex/Controllers/Api/Webhooks/Models/WebhookEventDto.cs
+++ b/src/Squidex/Controllers/Api/Webhooks/Models/WebhookEventDto.cs
@@ -13,7 +13,7 @@ using Squidex.Domain.Apps.Read.Webhooks;
 
 namespace Squidex.Controllers.Api.Webhooks.Models
 {
-    public class WebhookEventDto
+    public sealed class WebhookEventDto
     {
         /// <summary>
         /// The id of the event.
diff --git a/src/Squidex/Controllers/Api/Webhooks/Models/WebhookEventsDto.cs b/src/Squidex/Controllers/Api/Webhooks/Models/WebhookEventsDto.cs
index 06b4d0620..977f44c04 100644
--- a/src/Squidex/Controllers/Api/Webhooks/Models/WebhookEventsDto.cs
+++ b/src/Squidex/Controllers/Api/Webhooks/Models/WebhookEventsDto.cs
@@ -8,7 +8,7 @@
 
 namespace Squidex.Controllers.Api.Webhooks.Models
 {
-    public class WebhookEventsDto
+    public sealed class WebhookEventsDto
     {
         /// <summary>
         /// The total number of webhook events.
diff --git a/src/Squidex/Controllers/Api/Webhooks/Models/WebhookSchemaDto.cs b/src/Squidex/Controllers/Api/Webhooks/Models/WebhookSchemaDto.cs
index 32c89468d..d0dd44e65 100644
--- a/src/Squidex/Controllers/Api/Webhooks/Models/WebhookSchemaDto.cs
+++ b/src/Squidex/Controllers/Api/Webhooks/Models/WebhookSchemaDto.cs
@@ -10,7 +10,7 @@ using System;
 
 namespace Squidex.Controllers.Api.Webhooks.Models
 {
-    public class WebhookSchemaDto
+    public sealed class WebhookSchemaDto
     {
         /// <summary>
         /// The id of the schema.
diff --git a/src/Squidex/Controllers/Api/Webhooks/WebhooksController.cs b/src/Squidex/Controllers/Api/Webhooks/WebhooksController.cs
index 775f2f76e..19f152f11 100644
--- a/src/Squidex/Controllers/Api/Webhooks/WebhooksController.cs
+++ b/src/Squidex/Controllers/Api/Webhooks/WebhooksController.cs
@@ -29,7 +29,7 @@ namespace Squidex.Controllers.Api.Webhooks
     [AppApi]
     [SwaggerTag("Webhooks")]
     [MustBeAppDeveloper]
-    public class WebhooksController : ControllerBase
+    public sealed class WebhooksController : ControllerBase
     {
         private readonly IWebhookRepository webhooksRepository;
         private readonly IWebhookEventRepository webhookEventsRepository;
diff --git a/src/Squidex/Controllers/ContentApi/ContentSwaggerController.cs b/src/Squidex/Controllers/ContentApi/ContentSwaggerController.cs
index 014de14fc..12ff9ef87 100644
--- a/src/Squidex/Controllers/ContentApi/ContentSwaggerController.cs
+++ b/src/Squidex/Controllers/ContentApi/ContentSwaggerController.cs
@@ -20,7 +20,7 @@ namespace Squidex.Controllers.ContentApi
 {
     [ApiExceptionFilter]
     [SwaggerIgnore]
-    public class ContentSwaggerController : Controller
+    public sealed class ContentSwaggerController : Controller
     {
         private readonly ISchemaRepository schemaRepository;
         private readonly IAppProvider appProvider;
diff --git a/src/Squidex/Controllers/ContentApi/ContentsController.cs b/src/Squidex/Controllers/ContentApi/ContentsController.cs
index 37d02ee7a..df74c4df8 100644
--- a/src/Squidex/Controllers/ContentApi/ContentsController.cs
+++ b/src/Squidex/Controllers/ContentApi/ContentsController.cs
@@ -32,7 +32,7 @@ namespace Squidex.Controllers.ContentApi
     [ApiExceptionFilter]
     [AppApi]
     [SwaggerIgnore]
-    public class ContentsController : ControllerBase
+    public sealed class ContentsController : ControllerBase
     {
         private readonly ISchemaProvider schemas;
         private readonly IContentRepository contentRepository;
diff --git a/src/Squidex/Controllers/ContentApi/Models/ContentsDto.cs b/src/Squidex/Controllers/ContentApi/Models/ContentsDto.cs
index d1d594ca3..62c345510 100644
--- a/src/Squidex/Controllers/ContentApi/Models/ContentsDto.cs
+++ b/src/Squidex/Controllers/ContentApi/Models/ContentsDto.cs
@@ -8,7 +8,7 @@
 
 namespace Squidex.Controllers.ContentApi.Models
 {
-    public class AssetsDto
+    public sealed class AssetsDto
     {
         /// <summary>
         /// The total number of content items.
diff --git a/src/Squidex/Controllers/UI/Error/ErrorController.cs b/src/Squidex/Controllers/UI/Error/ErrorController.cs
index aa471c875..c37a91c7f 100644
--- a/src/Squidex/Controllers/UI/Error/ErrorController.cs
+++ b/src/Squidex/Controllers/UI/Error/ErrorController.cs
@@ -12,7 +12,7 @@ using NSwag.Annotations;
 namespace Squidex.Controllers.UI.Error
 {
     [SwaggerIgnore]
-    public class ErrorController : Controller
+    public sealed class ErrorController : Controller
     {
         [Route("error")]
         public IActionResult Error()
diff --git a/src/Squidex/Controllers/UI/Profile/PortalController.cs b/src/Squidex/Controllers/UI/Profile/PortalController.cs
index 9dc89038f..deb8f6c05 100644
--- a/src/Squidex/Controllers/UI/Profile/PortalController.cs
+++ b/src/Squidex/Controllers/UI/Profile/PortalController.cs
@@ -17,7 +17,7 @@ namespace Squidex.Controllers.UI.Profile
 {
     [Authorize]
     [SwaggerIgnore]
-    public class PortalController : Controller
+    public sealed class PortalController : Controller
     {
         private readonly IAppPlanBillingManager appPlansBillingManager;
 
diff --git a/src/Squidex/Controllers/UI/Profile/ProfileController.cs b/src/Squidex/Controllers/UI/Profile/ProfileController.cs
index 15eec326b..c065d6bf4 100644
--- a/src/Squidex/Controllers/UI/Profile/ProfileController.cs
+++ b/src/Squidex/Controllers/UI/Profile/ProfileController.cs
@@ -27,7 +27,7 @@ namespace Squidex.Controllers.UI.Profile
 {
     [Authorize]
     [SwaggerIgnore]
-    public class ProfileController : Controller
+    public sealed class ProfileController : Controller
     {
         private readonly SignInManager<IUser> signInManager;
         private readonly UserManager<IUser> userManager;
diff --git a/src/Squidex/Startup.cs b/src/Squidex/Startup.cs
index c7559180d..8c6ca15fb 100644
--- a/src/Squidex/Startup.cs
+++ b/src/Squidex/Startup.cs
@@ -76,6 +76,8 @@ namespace Squidex
                 Configuration.GetSection("urls"));
             services.Configure<MyIdentityOptions>(
                 Configuration.GetSection("identity"));
+            services.Configure<MyUrlsOptions>(
+                Configuration.GetSection("ui"));
             services.Configure<MyUsageOptions>(
                 Configuration.GetSection("usage"));
 
diff --git a/src/Squidex/appsettings.json b/src/Squidex/appsettings.json
index b603429ea..585bfb045 100644
--- a/src/Squidex/appsettings.json
+++ b/src/Squidex/appsettings.json
@@ -6,6 +6,15 @@
     "baseUrl": "http://localhost:5000"
   },
 
+  "ui": {
+    "regexSuggestions": {
+      "Email": "^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\\\\.[a-zA-Z0-9-]+)*$",
+      "Phone": "^\\(*\\+*[1-9]{0,3}\\)*-*[1-9]{0,3}[-. /]*\\(*[2-9]\\d{2}\\)*[-. /]*\\d{3}[-. /]*\\d{4} *e*x*t*\\.* *\\d{0,4}$",
+      "Slug": "^[a-z0-9]+(\\\\-[a-z0-9]+)*$",
+      "Url": "^(?:http(s)?:\\/\\/)?[\\w.-]+(?:\\.[\\w\\.-]+)+[\\w\\-\\._~:/?#[\\]@!\\$&'\\(\\)\\*\\+,;=.]+$"
+    }
+  },
+
   "logging": {
     /*
      * Setting the flag to true, enables well formatteds json logs.