[9.x] Use dedicated method for placeholdr replacement (#44296)

Author: iamgergo

src/Illuminate/Validation/Validator.php

@@ -875,11 +875,7 @@ public function addFailure($attribute, $rule, $parameters = [])
 
         $attributeWithPlaceholders = $attribute;
 
-        $attribute = str_replace(
-            [$this->dotPlaceholder, '__asterisk__'],
-            ['.', '*'],
-            $attribute
-        );
+        $attribute = $this->replacePlaceholderInString($attribute);
 
         if (in_array($rule, $this->excludeRules)) {
             return $this->excludeAttribute($attribute);