diff --git a/specification/billing/resource-manager/Microsoft.Billing/stable/2024-04-01/policy.json b/specification/billing/resource-manager/Microsoft.Billing/stable/2024-04-01/policy.json
index 6568d69e102d..0886a0771b2b 100644
--- a/specification/billing/resource-manager/Microsoft.Billing/stable/2024-04-01/policy.json
+++ b/specification/billing/resource-manager/Microsoft.Billing/stable/2024-04-01/policy.json
@@ -40,7 +40,7 @@
             "description": "Service-defined resource names such as 'default' which are reserved resource names.",
             "required": true,
             "type": "string",
-            "pattern": "^[a-zA-Z\d-_]{1,128}$",
+            "pattern": "^[a-zA-Z0-9-_]{1,128}$",
             "enum": [
               "default"
             ],
diff --git a/specification/billing/resource-manager/Microsoft.Billing/stable/2024-04-01/types.json b/specification/billing/resource-manager/Microsoft.Billing/stable/2024-04-01/types.json
index 3d596c8768ae..00df36c3376b 100644
--- a/specification/billing/resource-manager/Microsoft.Billing/stable/2024-04-01/types.json
+++ b/specification/billing/resource-manager/Microsoft.Billing/stable/2024-04-01/types.json
@@ -255,7 +255,7 @@
       "description": "The ID that uniquely identifies a billing profile.",
       "required": true,
       "type": "string",
-      "pattern": "^[a-zA-Z\d-_]{1,128}$",
+      "pattern": "^[a-zA-Z0-9-_]{1,128}$",
       "x-ms-parameter-location": "method"
     },
     "customerName": {
@@ -264,7 +264,7 @@
       "description": "The ID that uniquely identifies a customer.",
       "required": true,
       "type": "string",
-      "pattern": "^[a-zA-Z\d-_]{1,128}$",
+      "pattern": "^[a-zA-Z0-9-_]{1,128}$",
       "x-ms-parameter-location": "method"
     },
     "invoiceSectionName": {
@@ -273,7 +273,7 @@
       "description": "The ID that uniquely identifies an invoice section.",
       "required": true,
       "type": "string",
-      "pattern": "^[a-zA-Z\d-_]{1,128}$",
+      "pattern": "^[a-zA-Z0-9-_]{1,128}$",
       "x-ms-parameter-location": "method"
     },
     "departmentName": {
@@ -282,7 +282,7 @@
       "description": "The name of the department.",
       "required": true,
       "type": "string",
-      "pattern": "^[a-zA-Z\d-_]{1,128}$",
+      "pattern": "^[a-zA-Z0-9-_]{1,128}$",
       "x-ms-parameter-location": "method"
     },
     "enrollmentAccountName": {
@@ -291,7 +291,7 @@
       "description": "The name of the enrollment account.",
       "required": true,
       "type": "string",
-      "pattern": "^[a-zA-Z\d-_]{1,128}$",
+      "pattern": "^[a-zA-Z0-9-_]{1,128}$",
       "x-ms-parameter-location": "method"
     },
     "subscriptionId": {