diff --git a/specification/cosmos-db/resource-manager/Microsoft.DocumentDB/preview/2021-03-01-preview/managedCassandra.json b/specification/cosmos-db/resource-manager/Microsoft.DocumentDB/preview/2021-03-01-preview/managedCassandra.json
index e92d963c7d24..bbb3ab098d2a 100644
--- a/specification/cosmos-db/resource-manager/Microsoft.DocumentDB/preview/2021-03-01-preview/managedCassandra.json
+++ b/specification/cosmos-db/resource-manager/Microsoft.DocumentDB/preview/2021-03-01-preview/managedCassandra.json
@@ -713,7 +713,7 @@
       "description": "Managed Cassandra cluster name.",
       "minLength": 1,
       "maxLength": 100,
-      "pattern": "^[a-zA-Z0-9]+(-[a-zA-Z0-9]+)*"
+      "pattern": "^[a-zA-Z0-9]+(-[a-zA-Z0-9]+)*$"
     },
     "dataCenterNameParameter": {
       "name": "dataCenterName",
@@ -724,7 +724,7 @@
       "description": "Data center name in a managed Cassandra cluster.",
       "minLength": 1,
       "maxLength": 100,
-      "pattern": "^[a-zA-Z0-9]+(-[a-zA-Z0-9]+)*"
+      "pattern": "^[a-zA-Z0-9]+(-[a-zA-Z0-9]+)*$"
     },
     "backupNameParameter": {
       "name": "backupId",
diff --git a/specification/cosmos-db/resource-manager/Microsoft.DocumentDB/preview/2021-04-01-preview/managedCassandra.json b/specification/cosmos-db/resource-manager/Microsoft.DocumentDB/preview/2021-04-01-preview/managedCassandra.json
index 9e7eb989459d..6754b9d6e5cc 100644
--- a/specification/cosmos-db/resource-manager/Microsoft.DocumentDB/preview/2021-04-01-preview/managedCassandra.json
+++ b/specification/cosmos-db/resource-manager/Microsoft.DocumentDB/preview/2021-04-01-preview/managedCassandra.json
@@ -713,7 +713,7 @@
       "description": "Managed Cassandra cluster name.",
       "minLength": 1,
       "maxLength": 100,
-      "pattern": "^[a-zA-Z0-9]+(-[a-zA-Z0-9]+)*"
+      "pattern": "^[a-zA-Z0-9]+(-[a-zA-Z0-9]+)*$"
     },
     "dataCenterNameParameter": {
       "name": "dataCenterName",
@@ -724,7 +724,7 @@
       "description": "Data center name in a managed Cassandra cluster.",
       "minLength": 1,
       "maxLength": 100,
-      "pattern": "^[a-zA-Z0-9]+(-[a-zA-Z0-9]+)*"
+      "pattern": "^[a-zA-Z0-9]+(-[a-zA-Z0-9]+)*$"
     },
     "backupNameParameter": {
       "name": "backupId",