diff --git a/specification/servicenetworking/resource-manager/Microsoft.ServiceNetworking/preview/2023-05-01-preview/TrafficController.json b/specification/servicenetworking/resource-manager/Microsoft.ServiceNetworking/preview/2023-05-01-preview/TrafficController.json
index 1fa422151ff7..53fc8aced975 100644
--- a/specification/servicenetworking/resource-manager/Microsoft.ServiceNetworking/preview/2023-05-01-preview/TrafficController.json
+++ b/specification/servicenetworking/resource-manager/Microsoft.ServiceNetworking/preview/2023-05-01-preview/TrafficController.json
@@ -192,8 +192,8 @@
             "in": "path",
             "required": true,
             "description": "traffic controller name for path",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           }
         ],
         "responses": {
@@ -237,8 +237,8 @@
             "in": "path",
             "required": true,
             "description": "traffic controller name for path",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           },
           {
             "name": "resource",
@@ -308,8 +308,8 @@
             "in": "path",
             "required": true,
             "description": "traffic controller name for path",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           },
           {
             "name": "properties",
@@ -362,8 +362,8 @@
             "in": "path",
             "required": true,
             "description": "traffic controller name for path",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           }
         ],
         "responses": {
@@ -427,8 +427,8 @@
             "in": "path",
             "required": true,
             "description": "traffic controller name for path",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           }
         ],
         "responses": {
@@ -477,16 +477,16 @@
             "in": "path",
             "required": true,
             "description": "traffic controller name for path",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           },
           {
             "name": "associationName",
             "in": "path",
             "required": true,
             "description": "Name of Association",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           }
         ],
         "responses": {
@@ -530,16 +530,16 @@
             "in": "path",
             "required": true,
             "description": "traffic controller name for path",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           },
           {
             "name": "associationName",
             "in": "path",
             "required": true,
             "description": "Name of Association",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           },
           {
             "name": "resource",
@@ -609,16 +609,16 @@
             "in": "path",
             "required": true,
             "description": "traffic controller name for path",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           },
           {
             "name": "associationName",
             "in": "path",
             "required": true,
             "description": "Name of Association",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           },
           {
             "name": "properties",
@@ -671,16 +671,16 @@
             "in": "path",
             "required": true,
             "description": "traffic controller name for path",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           },
           {
             "name": "associationName",
             "in": "path",
             "required": true,
             "description": "Name of Association",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           }
         ],
         "responses": {
@@ -744,8 +744,8 @@
             "in": "path",
             "required": true,
             "description": "traffic controller name for path",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           }
         ],
         "responses": {
@@ -794,16 +794,16 @@
             "in": "path",
             "required": true,
             "description": "traffic controller name for path",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           },
           {
             "name": "frontendName",
             "in": "path",
             "required": true,
             "description": "Frontends",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           }
         ],
         "responses": {
@@ -847,16 +847,16 @@
             "in": "path",
             "required": true,
             "description": "traffic controller name for path",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           },
           {
             "name": "frontendName",
             "in": "path",
             "required": true,
             "description": "Frontends",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           },
           {
             "name": "resource",
@@ -926,16 +926,16 @@
             "in": "path",
             "required": true,
             "description": "traffic controller name for path",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           },
           {
             "name": "frontendName",
             "in": "path",
             "required": true,
             "description": "Frontends",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           },
           {
             "name": "properties",
@@ -988,16 +988,16 @@
             "in": "path",
             "required": true,
             "description": "traffic controller name for path",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           },
           {
             "name": "frontendName",
             "in": "path",
             "required": true,
             "description": "Frontends",
-            "pattern": "[A-Za-z0-9]+[A-Za-z0-9-_.]{0,62}[A-Za-z0-9_]+",
-            "type": "string"
+            "type": "string",
+            "pattern": "^[A-Za-z0-9]([A-Za-z0-9-_.]{0,62}[A-Za-z0-9])?$"
           }
         ],
         "responses": {