Domain constraints for Symfony Validator

domain_constraints_news_slug.php

<?php

use Symfony\Component\Validator\Constraints as Assert;

final class NewsDto
{
    /**
     * @Assert\NotNull()
     * @Assert\Type("string")
     * @Assert\Length(min=5, max=50)
     * @Assert\Regex("/^[a-z0-9-]$/", message="Slug must be composed of lowercase latin letters, digits and dashes.")
     *
     * @var null|string
     */
    public $slug;
}