Symfony Validator Constraints Regex behaves differently to PHP preg_match condition

ChangeName.php

<?php

namespace Acme\PersonnelManagement\Application\Service\Person;

use Acme\Common\Domain\Model\FirstName;
use Symfony\Component\Validator\Constraints as Assert;

final class ChangeName
{
    /**
     * @var FirstName
     * @Assert\NotNull
     * @Assert\NotBlank
     * @Assert\Type(type="string")
     * @Assert\Regex(pattern="/^[\p{L}\\-\\. \']+$/u")
     */
    private $firstName;
}

NamePolicy.php

<?php

namespace Acme\Common\Domain\Model\PersonalName;

final class NamePolicy
{
    public static function isSatisfiedBy(string $name): bool
    {
        if (empty($name)) {
            return false;
        }

        // Allowed are unicode letters only and `.`, `-`, `'`, no numbers.
        if (0 === preg_match("/^[\p{L}\\-\\. \']+$/u", $name)) {
            return false;
        }

        // Continuous uppercase letters are not allowed.
        if (1 === preg_match("/[\p{Lu}]{2,}/u", $name)) {
            return false;
        }

        return true;
    }
}

NamePolicyTest.php

<?php

namespace Tests\Acme\Common\Domain\PersonalName;

use PHPUnit\Framework\TestCase;
use Acme\Common\Domain\Model\PersonalName\NamePolicy;

final class NamePolicyTest extends TestCase
{
      /** @test */
    public function hyphenSeparatedDoubleNamesAreAllowed(): void
    {
        $policy = NamePolicy::isSatisfiedBy('Hans-Werner');

        $this->assertTrue($policy);
    }
}

Improved by @freshp:

        // Allowed are unicode letters only and `.`, `-`, `'`, no numbers.
        if (1 !== preg_match("/^[\p{L}\-\.\s\']+$/u", $name)) {
            return false;
        }