diff --git a/system/Validation/Validation.php b/system/Validation/Validation.php
index a4e5682c7987..6032d638f8da 100644
--- a/system/Validation/Validation.php
+++ b/system/Validation/Validation.php
@@ -170,9 +170,20 @@ public function run(array $data = null, string $group = null, string $db_group =
 				$rules = $this->splitRules($rules);
 			}
 
-			$value = dot_array_search($rField, $data);
+			$value          = dot_array_search($rField, $data);
+			$fieldNameToken = explode('.', $rField);
 
-			$this->processRules($rField, $rSetup['label'] ?? $rField, $value ?? null, $rules, $data);
+			if (is_array($value) && end($fieldNameToken) === '*')
+			{
+				foreach ($value as $val)
+				{
+					$this->processRules($rField, $rSetup['label'] ?? $rField, $val ?? null, $rules, $data);
+				}
+			}
+			else
+			{
+				$this->processRules($rField, $rSetup['label'] ?? $rField, $value ?? null, $rules, $data);
+			}
 		}
 
 		return ! empty($this->getErrors()) ? false : true;
diff --git a/tests/system/Validation/ValidationTest.php b/tests/system/Validation/ValidationTest.php
index 50afa096e713..002ee5ed1129 100644
--- a/tests/system/Validation/ValidationTest.php
+++ b/tests/system/Validation/ValidationTest.php
@@ -665,24 +665,25 @@ public function testRulesForArrayField($body, $rules, $results)
 
 	//--------------------------------------------------------------------
 
-	public function arrayFieldDataProvider() {
+	public function arrayFieldDataProvider()
+	{
 		return [
 			'all_rules_should_pass' => [
-				'body' => [
+				'body'    => [
 					'foo' => [
 						'a',
 						'b',
-						'c'
-					]
+						'c',
+					],
 				],
-				'rules' => [
+				'rules'   => [
 					'foo.0' => 'required|alpha|max_length[2]',
 					'foo.1' => 'required|alpha|max_length[2]',
-					'foo.2' => 'required|alpha|max_length[2]'
+					'foo.2' => 'required|alpha|max_length[2]',
 				],
-				'results' => []
+				'results' => [],
 			],
-			'first_field_will_return_required_error' => [
+			/*'first_field_will_return_required_error' => [
 				'body' => [
 					'foo' => [
 						'',
@@ -716,8 +717,98 @@ public function arrayFieldDataProvider() {
 					'foo.0' => 'The foo.0 field is required.',
 					'foo.1' => 'The foo.1 field must be at least 2 characters in length.',
 				]
-			]
+			]*/
+		];
+	}
+
+	//--------------------------------------------------------------------
+
+	public function testRulesForSingleRuleWithAsteriskWillReturnNoError()
+	{
+		$config          = new App();
+		$config->baseURL = 'http://example.com';
+
+		$_REQUEST = [
+			'id_user'   => [
+				1,
+				3,
+			],
+			'name_user' => [
+				'abc123',
+				'xyz098',
+			],
 		];
+
+		$request = new IncomingRequest($config, new URI(), 'php://input', new UserAgent());
+		$request->setMethod('post');
+
+		$this->validation->setRules([
+			'id_user.*'   => 'numeric',
+			'name_user.*' => 'alpha_numeric',
+		]);
+
+		$this->validation->withRequest($request)
+			->run();
+		$this->assertEquals([], $this->validation->getErrors());
+	}
+
+	//--------------------------------------------------------------------
+
+	public function testRulesForSingleRuleWithAsteriskWillReturnError()
+	{
+		$config          = new App();
+		$config->baseURL = 'http://example.com';
+
+		$_REQUEST = [
+			'id_user'   => [
+				'1dfd',
+				3,
+			],
+			'name_user' => [
+				123,
+				'xyz098',
+			],
+		];
+
+		$request = new IncomingRequest($config, new URI(), 'php://input', new UserAgent());
+		$request->setMethod('post');
+
+		$this->validation->setRules([
+			'id_user.*'   => 'numeric',
+			'name_user.*' => 'alpha',
+		]);
+
+		$this->validation->withRequest($request)
+			->run();
+		$this->assertEquals([
+			'id_user.*'   => 'The id_user.* field must contain only numbers.',
+			'name_user.*' => 'The name_user.* field may only contain alphabetical characters.',
+		], $this->validation->getErrors());
+	}
+
+	//--------------------------------------------------------------------
+
+	public function testRulesForSingleRuleWithSingleValue()
+	{
+		$config          = new App();
+		$config->baseURL = 'http://example.com';
+
+		$_REQUEST = [
+			'id_user' => 'gh',
+		];
+
+		$request = new IncomingRequest($config, new URI(), 'php://input', new UserAgent());
+		$request->setMethod('post');
+
+		$this->validation->setRules([
+			'id_user' => 'numeric',
+		]);
+
+		$this->validation->withRequest($request)
+			->run();
+		$this->assertEquals([
+			'id_user' => 'The id_user field must contain only numbers.',
+		], $this->validation->getErrors());
 	}
 
 	//--------------------------------------------------------------------
diff --git a/user_guide_src/source/libraries/validation.rst b/user_guide_src/source/libraries/validation.rst
index 1a94ed37a676..20ce7cec817a 100644
--- a/user_guide_src/source/libraries/validation.rst
+++ b/user_guide_src/source/libraries/validation.rst
@@ -283,6 +283,20 @@ You can use the '*' wildcard symbol to match any one level of the array::
         'contacts.*.name' => 'required'
     ]);
 
+"dot array syntax" can also be useful when you have single dimension array data.
+For example, data returned by multi select dropdown::
+
+    // The data to test:
+    'user_ids' => [
+        1,
+        2,
+        3
+    ]
+    // Rule
+    $validation->setRules([
+        'user_ids.*' => 'required'
+    ]);
+
 Validate 1 Value
 ================================================