Issue #3500218: Use attributes for RegexpValidator plugin

Related to #3500218

src/Plugin/FapiValidationValidator/RegexpValidator.php

@@ -3,17 +3,20 @@
 namespace Drupal\fapi_validation\Plugin\FapiValidationValidator;
 
 use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+use Drupal\fapi_validation\Attribute\FapiValidationValidator;
 use Drupal\fapi_validation\FapiValidationValidatorsInterface;
 use Drupal\fapi_validation\Validator;
 
 /**
  * Fapi Validation Plugin for Regex validation.
- *
- * @FapiValidationValidator(
- *   id = "regexp",
- *   error_message = "%field value does not match rule."
- * )
  */
+#[FapiValidationValidator(
+  id: 'regexp',
+  label: new TranslatableMarkup('Regex'),
+  description: new TranslatableMarkup('Validates input value based on performing a regular expression match.'),
+  error_message: '%field value does not match rule.',
+)]
 class RegexpValidator implements FapiValidationValidatorsInterface {
 
   /**