Validator.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\StaticURL\Shortlinks\Shortlink;
 
class Validator
{
    public const string PATTERN = '/^[a-zA-Z0-9\-_]+$/';
 
    public function isValid(string $alias): bool
    {
        // only a-zA-Z0-9-_ allowed
        return preg_match(self::PATTERN, $alias) === 1;
    }
}