diff --git a/src/main/java/org/opensearch/sdk/sample/helloworld/ExampleCustomSettingConfig.java b/src/main/java/org/opensearch/sdk/sample/helloworld/ExampleCustomSettingConfig.java
new file mode 100644
index 00000000..dc2409af
--- /dev/null
+++ b/src/main/java/org/opensearch/sdk/sample/helloworld/ExampleCustomSettingConfig.java
@@ -0,0 +1,32 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.sdk.sample.helloworld;
+
+import org.opensearch.common.settings.Setting;
+import org.opensearch.common.settings.Setting.RegexValidator;
+import org.opensearch.common.settings.Setting.Property;
+
+/**
+ * {@link ExampleCustomSettingConfig} contains the custom settings value and their static declarations.
+ */
+public class ExampleCustomSettingConfig {
+    private static final String FORBIDDEN_REGEX = "forbidden";
+
+    /**
+     * A string setting. If the string setting matches the FORBIDDEN_REGEX string, the validation will fail.
+     */
+    public static final Setting<String> VALIDATED_SETTING = Setting.simpleString(
+        "custom.validate",
+        new RegexValidator(FORBIDDEN_REGEX),
+        Property.NodeScope,
+        Property.Dynamic
+    );
+
+}
diff --git a/src/main/java/org/opensearch/sdk/sample/helloworld/HelloWorldExtension.java b/src/main/java/org/opensearch/sdk/sample/helloworld/HelloWorldExtension.java
index 13a8273e..faf48e03 100644
--- a/src/main/java/org/opensearch/sdk/sample/helloworld/HelloWorldExtension.java
+++ b/src/main/java/org/opensearch/sdk/sample/helloworld/HelloWorldExtension.java
@@ -15,6 +15,7 @@
 
 import org.opensearch.action.ActionRequest;
 import org.opensearch.action.ActionResponse;
+import org.opensearch.common.settings.Setting;
 import org.opensearch.sdk.BaseExtension;
 import org.opensearch.sdk.Extension;
 import org.opensearch.sdk.ExtensionRestHandler;
@@ -63,6 +64,13 @@ public List<ExtensionRestHandler> getExtensionRestHandlers() {
         return Arrays.asList(new ActionHandler<>(SampleAction.INSTANCE, SampleTransportAction.class));
     }
 
+    /**
+     * A list of object that includes a single instance of Validator for Custom Setting
+     */
+    public List<Setting<?>> getSettings() {
+        return Arrays.asList(ExampleCustomSettingConfig.VALIDATED_SETTING);
+    }
+
     /**
      * Entry point to execute an extension.
      *
diff --git a/src/test/java/org/opensearch/sdk/sample/helloworld/TestHelloWorldExtension.java b/src/test/java/org/opensearch/sdk/sample/helloworld/TestHelloWorldExtension.java
index ffbb7bf4..0d7ca099 100644
--- a/src/test/java/org/opensearch/sdk/sample/helloworld/TestHelloWorldExtension.java
+++ b/src/test/java/org/opensearch/sdk/sample/helloworld/TestHelloWorldExtension.java
@@ -44,6 +44,8 @@
 import com.google.inject.Injector;
 import com.google.inject.Key;
 
+import static org.opensearch.sdk.sample.helloworld.ExampleCustomSettingConfig.VALIDATED_SETTING;
+
 public class TestHelloWorldExtension extends OpenSearchTestCase {
 
     private HelloWorldExtension extension;
@@ -237,4 +239,16 @@ public void onFailure(Exception e) {
 
         assertEquals("failed to find action [" + UnregisteredAction.INSTANCE + "] to execute", ex.getMessage());
     }
+
+    public void testValidatedSettings() {
+        final String expected = randomAlphaOfLengthBetween(1, 5);
+        final String actual = VALIDATED_SETTING.get(Settings.builder().put(VALIDATED_SETTING.getKey(), expected).build());
+        assertEquals(expected, actual);
+
+        final IllegalArgumentException exception = expectThrows(
+            IllegalArgumentException.class,
+            () -> VALIDATED_SETTING.get(Settings.builder().put("custom.validated", "it's forbidden").build())
+        );
+        assertEquals("Setting must not contain [forbidden]", exception.getMessage());
+    }
 }