[12.x] Allow sub-array notation in arrays validation

src/Illuminate/Validation/Validator.php

@@ -1222,6 +1222,7 @@ public function setRules(array $rules)
             ->mapWithKeys(function ($value, $key) {
                 return [str_replace('\.', '__dot__'.static::$placeholderHash, $key) => $value];
             })
+            ->dot()
             ->toArray();
 
         $this->initialRules = $rules;

tests/Foundation/FoundationFormRequestTest.php

@@ -71,6 +71,17 @@ public function testValidatedMethodReturnsTheValidatedDataNestedArrayRules()
         $this->assertEquals(['nested' => [['bar' => 'baz'], ['bar' => 'baz2']]], $request->validated());
     }
 
+    public function testValidatedMethodReturnsTheValidatedDataNestedWildcardArrayRules()
+    {
+        $payload = ['nested' => [['bar' => 'baz', 'with' => 'extras'], ['bar' => 'baz2', 'with' => 'extras']]];
+
+        $request = $this->createRequest($payload, FoundationTestFormRequestNestedWildcardArrayStub::class);
+
+        $request->validateResolved();
+
+        $this->assertEquals(['nested' => [['bar' => 'baz'], ['bar' => 'baz2']]], $request->validated());
+    }
+
     public function testValidatedMethodNotValidateTwice()
     {
         $payload = ['name' => 'specified', 'with' => 'extras'];
@@ -384,6 +395,25 @@ public function authorize()
     }
 }
 
+class FoundationTestFormRequestNestedWildcardArrayStub extends FormRequest
+{
+    public function rules()
+    {
+        return [
+            'nested' => [
+                '*' => [
+                    'bar' => 'required',
+                ],
+            ],
+        ];
+    }
+
+    public function authorize()
+    {
+        return true;
+    }
+}
+
 class FoundationTestFormRequestTwiceStub extends FormRequest
 {
     public static $count = 0;