diff --git a/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/backendpools.go b/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/backendpools.go
index 64d2f9df24f9..8d1433b7222f 100644
--- a/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/backendpools.go
+++ b/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/backendpools.go
@@ -53,9 +53,9 @@ func (client BackendPoolsClient) CreateOrUpdate(ctx context.Context, resourceGro
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: backendPoolName,
 			Constraints: []validation.Constraint{{Target: "backendPoolName", Name: validation.MaxLength, Rule: 90, Chain: nil},
 				{Target: "backendPoolName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -144,9 +144,9 @@ func (client BackendPoolsClient) Delete(ctx context.Context, resourceGroupName s
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: backendPoolName,
 			Constraints: []validation.Constraint{{Target: "backendPoolName", Name: validation.MaxLength, Rule: 90, Chain: nil},
 				{Target: "backendPoolName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -232,9 +232,9 @@ func (client BackendPoolsClient) Get(ctx context.Context, resourceGroupName stri
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: backendPoolName,
 			Constraints: []validation.Constraint{{Target: "backendPoolName", Name: validation.MaxLength, Rule: 90, Chain: nil},
 				{Target: "backendPoolName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -316,9 +316,9 @@ func (client BackendPoolsClient) ListByFrontDoor(ctx context.Context, resourceGr
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}}}); err != nil {
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}}}); err != nil {
 		return result, validation.NewError("frontdoor.BackendPoolsClient", "ListByFrontDoor", err.Error())
 	}
 
diff --git a/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/endpoints.go b/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/endpoints.go
index 8c18f41cb533..58b8b444e7e5 100644
--- a/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/endpoints.go
+++ b/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/endpoints.go
@@ -54,9 +54,9 @@ func (client EndpointsClient) PurgeContent(ctx context.Context, resourceGroupNam
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: contentFilePaths,
 			Constraints: []validation.Constraint{{Target: "contentFilePaths.ContentPaths", Name: validation.Null, Rule: true, Chain: nil}}}}); err != nil {
 		return result, validation.NewError("frontdoor.EndpointsClient", "PurgeContent", err.Error())
diff --git a/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/frontdoors.go b/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/frontdoors.go
index 4d266046fbc8..c63a90e3c9e8 100644
--- a/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/frontdoors.go
+++ b/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/frontdoors.go
@@ -52,9 +52,9 @@ func (client FrontDoorsClient) CreateOrUpdate(ctx context.Context, resourceGroup
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}}}); err != nil {
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}}}); err != nil {
 		return result, validation.NewError("frontdoor.FrontDoorsClient", "CreateOrUpdate", err.Error())
 	}
 
@@ -137,9 +137,9 @@ func (client FrontDoorsClient) Delete(ctx context.Context, resourceGroupName str
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}}}); err != nil {
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}}}); err != nil {
 		return result, validation.NewError("frontdoor.FrontDoorsClient", "Delete", err.Error())
 	}
 
@@ -219,9 +219,9 @@ func (client FrontDoorsClient) Get(ctx context.Context, resourceGroupName string
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}}}); err != nil {
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}}}); err != nil {
 		return result, validation.NewError("frontdoor.FrontDoorsClient", "Get", err.Error())
 	}
 
@@ -491,9 +491,9 @@ func (client FrontDoorsClient) ValidateCustomDomain(ctx context.Context, resourc
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: customDomainProperties,
 			Constraints: []validation.Constraint{{Target: "customDomainProperties.HostName", Name: validation.Null, Rule: true, Chain: nil}}}}); err != nil {
 		return result, validation.NewError("frontdoor.FrontDoorsClient", "ValidateCustomDomain", err.Error())
diff --git a/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/frontendendpoints.go b/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/frontendendpoints.go
index 9b35c790286a..1d128b5ff236 100644
--- a/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/frontendendpoints.go
+++ b/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/frontendendpoints.go
@@ -53,9 +53,9 @@ func (client FrontendEndpointsClient) CreateOrUpdate(ctx context.Context, resour
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: frontendEndpointName,
 			Constraints: []validation.Constraint{{Target: "frontendEndpointName", Name: validation.MaxLength, Rule: 255, Chain: nil},
 				{Target: "frontendEndpointName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -144,9 +144,9 @@ func (client FrontendEndpointsClient) Delete(ctx context.Context, resourceGroupN
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: frontendEndpointName,
 			Constraints: []validation.Constraint{{Target: "frontendEndpointName", Name: validation.MaxLength, Rule: 255, Chain: nil},
 				{Target: "frontendEndpointName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -232,9 +232,9 @@ func (client FrontendEndpointsClient) DisableHTTPS(ctx context.Context, resource
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: frontendEndpointName,
 			Constraints: []validation.Constraint{{Target: "frontendEndpointName", Name: validation.MaxLength, Rule: 255, Chain: nil},
 				{Target: "frontendEndpointName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -321,9 +321,9 @@ func (client FrontendEndpointsClient) EnableHTTPS(ctx context.Context, resourceG
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: frontendEndpointName,
 			Constraints: []validation.Constraint{{Target: "frontendEndpointName", Name: validation.MaxLength, Rule: 255, Chain: nil},
 				{Target: "frontendEndpointName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -411,9 +411,9 @@ func (client FrontendEndpointsClient) Get(ctx context.Context, resourceGroupName
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: frontendEndpointName,
 			Constraints: []validation.Constraint{{Target: "frontendEndpointName", Name: validation.MaxLength, Rule: 255, Chain: nil},
 				{Target: "frontendEndpointName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -495,9 +495,9 @@ func (client FrontendEndpointsClient) ListByFrontDoor(ctx context.Context, resou
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}}}); err != nil {
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}}}); err != nil {
 		return result, validation.NewError("frontdoor.FrontendEndpointsClient", "ListByFrontDoor", err.Error())
 	}
 
diff --git a/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/healthprobesettings.go b/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/healthprobesettings.go
index 498987ce2eca..1b99189407a7 100644
--- a/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/healthprobesettings.go
+++ b/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/healthprobesettings.go
@@ -53,9 +53,9 @@ func (client HealthProbeSettingsClient) CreateOrUpdate(ctx context.Context, reso
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: healthProbeSettingsName,
 			Constraints: []validation.Constraint{{Target: "healthProbeSettingsName", Name: validation.MaxLength, Rule: 90, Chain: nil},
 				{Target: "healthProbeSettingsName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -144,9 +144,9 @@ func (client HealthProbeSettingsClient) Delete(ctx context.Context, resourceGrou
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: healthProbeSettingsName,
 			Constraints: []validation.Constraint{{Target: "healthProbeSettingsName", Name: validation.MaxLength, Rule: 90, Chain: nil},
 				{Target: "healthProbeSettingsName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -232,9 +232,9 @@ func (client HealthProbeSettingsClient) Get(ctx context.Context, resourceGroupNa
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: healthProbeSettingsName,
 			Constraints: []validation.Constraint{{Target: "healthProbeSettingsName", Name: validation.MaxLength, Rule: 90, Chain: nil},
 				{Target: "healthProbeSettingsName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -316,9 +316,9 @@ func (client HealthProbeSettingsClient) ListByFrontDoor(ctx context.Context, res
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}}}); err != nil {
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}}}); err != nil {
 		return result, validation.NewError("frontdoor.HealthProbeSettingsClient", "ListByFrontDoor", err.Error())
 	}
 
diff --git a/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/loadbalancingsettings.go b/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/loadbalancingsettings.go
index fe1c175a6bef..1fa742347ff5 100644
--- a/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/loadbalancingsettings.go
+++ b/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/loadbalancingsettings.go
@@ -53,9 +53,9 @@ func (client LoadBalancingSettingsClient) CreateOrUpdate(ctx context.Context, re
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: loadBalancingSettingsName,
 			Constraints: []validation.Constraint{{Target: "loadBalancingSettingsName", Name: validation.MaxLength, Rule: 90, Chain: nil},
 				{Target: "loadBalancingSettingsName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -144,9 +144,9 @@ func (client LoadBalancingSettingsClient) Delete(ctx context.Context, resourceGr
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: loadBalancingSettingsName,
 			Constraints: []validation.Constraint{{Target: "loadBalancingSettingsName", Name: validation.MaxLength, Rule: 90, Chain: nil},
 				{Target: "loadBalancingSettingsName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -232,9 +232,9 @@ func (client LoadBalancingSettingsClient) Get(ctx context.Context, resourceGroup
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: loadBalancingSettingsName,
 			Constraints: []validation.Constraint{{Target: "loadBalancingSettingsName", Name: validation.MaxLength, Rule: 90, Chain: nil},
 				{Target: "loadBalancingSettingsName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -316,9 +316,9 @@ func (client LoadBalancingSettingsClient) ListByFrontDoor(ctx context.Context, r
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}}}); err != nil {
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}}}); err != nil {
 		return result, validation.NewError("frontdoor.LoadBalancingSettingsClient", "ListByFrontDoor", err.Error())
 	}
 
diff --git a/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/routingrules.go b/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/routingrules.go
index 01922b3225c0..7acffd949a3c 100644
--- a/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/routingrules.go
+++ b/services/preview/frontdoor/mgmt/2018-08-01-preview/frontdoor/routingrules.go
@@ -53,9 +53,9 @@ func (client RoutingRulesClient) CreateOrUpdate(ctx context.Context, resourceGro
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: routingRuleName,
 			Constraints: []validation.Constraint{{Target: "routingRuleName", Name: validation.MaxLength, Rule: 90, Chain: nil},
 				{Target: "routingRuleName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -144,9 +144,9 @@ func (client RoutingRulesClient) Delete(ctx context.Context, resourceGroupName s
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: routingRuleName,
 			Constraints: []validation.Constraint{{Target: "routingRuleName", Name: validation.MaxLength, Rule: 90, Chain: nil},
 				{Target: "routingRuleName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -232,9 +232,9 @@ func (client RoutingRulesClient) Get(ctx context.Context, resourceGroupName stri
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}},
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}},
 		{TargetValue: routingRuleName,
 			Constraints: []validation.Constraint{{Target: "routingRuleName", Name: validation.MaxLength, Rule: 90, Chain: nil},
 				{Target: "routingRuleName", Name: validation.MinLength, Rule: 1, Chain: nil},
@@ -316,9 +316,9 @@ func (client RoutingRulesClient) ListByFrontDoor(ctx context.Context, resourceGr
 				{Target: "resourceGroupName", Name: validation.MinLength, Rule: 1, Chain: nil},
 				{Target: "resourceGroupName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9_\-\(\)\.]*[^\.]$`, Chain: nil}}},
 		{TargetValue: frontDoorName,
-			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 74, Chain: nil},
+			Constraints: []validation.Constraint{{Target: "frontDoorName", Name: validation.MaxLength, Rule: 64, Chain: nil},
 				{Target: "frontDoorName", Name: validation.MinLength, Rule: 5, Chain: nil},
-				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9][a-zA-Z0-9])$`, Chain: nil}}}}); err != nil {
+				{Target: "frontDoorName", Name: validation.Pattern, Rule: `^[a-zA-Z0-9]+([-a-zA-Z0-9]?[a-zA-Z0-9])*$`, Chain: nil}}}}); err != nil {
 		return result, validation.NewError("frontdoor.RoutingRulesClient", "ListByFrontDoor", err.Error())
 	}