diff --git a/DEVELOPER_GUIDE.md b/DEVELOPER_GUIDE.md
index 64df651e..b56c3e9d 100644
--- a/DEVELOPER_GUIDE.md
+++ b/DEVELOPER_GUIDE.md
@@ -304,7 +304,7 @@ The artifact will include extension settings for the sample Hello World extensio
 ```
 
 You can optionally add `routeNamePrefix:` as a value to the yml. This setting allows you to prefix all your registered NamedRoute names.
-The value must be alphanumeric and can contain `:`, `/`, `*`, `_` in the name.
+The value must be alphanumeric and can contain `-`, `_` in the name.
 
 Start the sample extension with `./bin/opensearch-sdk-java`
 
diff --git a/src/main/java/org/opensearch/sdk/rest/BaseExtensionRestHandler.java b/src/main/java/org/opensearch/sdk/rest/BaseExtensionRestHandler.java
index 7af23e17..5f11ab3b 100644
--- a/src/main/java/org/opensearch/sdk/rest/BaseExtensionRestHandler.java
+++ b/src/main/java/org/opensearch/sdk/rest/BaseExtensionRestHandler.java
@@ -44,7 +44,7 @@
  */
 public abstract class BaseExtensionRestHandler implements ExtensionRestHandler {
 
-    private static final String VALID_ROUTE_PREFIX_PATTERN = "^[a-zA-Z0-9:/*_]*$";
+    private static final String VALID_ROUTE_PREFIX_PATTERN = "^[a-zA-Z0-9-_]*$";
 
     private String routeNamePrefix;