ExtensionNameConstraint.php

<?php

declare (strict_types=1);
namespace Drupal\Core\Extension\Plugin\Validation\Constraint;

use Drupal\Core\Extension\ExtensionDiscovery;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\Validation\Attribute\Constraint;
use Drupal\Core\Validation\Plugin\Validation\Constraint\RegexConstraint;
use Symfony\Component\Validator\Attribute\HasNamedArguments;

/**
 * Checks that the value is a valid extension name.
 */
class ExtensionNameConstraint extends RegexConstraint {
  public function __construct(string|array|null $pattern, ?string $message = 'This value is not a valid extension name.', ?string $htmlPattern = NULL, ?bool $match = NULL, ?callable $normalizer = NULL, ?array $groups = NULL, mixed $payload = NULL, ?array $options = NULL) {
    // Always use the regular expression that ExtensionDiscovery uses to find
    // valid extensions.
    $pattern = ExtensionDiscovery::PHP_FUNCTION_PATTERN;
    parent::__construct($pattern, $message, $htmlPattern, $match, $normalizer, $groups, $payload, $options);
  }

}