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;

/**
 * Checks that the value is a valid extension name.
 */
class ExtensionNameConstraint extends RegexConstraint {
    
    /**
     * Constructs an ExtensionNameConstraint object.
     *
     * @param string|array|null $pattern
     *   The regular expression to test for.
     * @param mixed ...$arguments
     *   Arguments to pass to the parent constructor.
     */
    public function __construct(string|array|null $pattern, ...$arguments) {
        // Always use the regular expression that ExtensionDiscovery uses to find
        // valid extensions.
        $pattern = ExtensionDiscovery::PHP_FUNCTION_PATTERN;
        parent::__construct($pattern, ...$arguments);
    }

}