Magento 2 does not allow Special characters in First Name & Last name even though the Input Validation is None

Question

In my magento setup I am not able to insert special characters for customer First name and Last name.

The Input Validation for Customer Attribute First Name and Last Name is NONE. But still Magento 2 not allowing me to insert special characters for customer First name and Last name.

I also checked in a fresh magento 2 installation setup and there I am able to insert special characters.

Please help. I am using Magento 2.4.2

Customer Attribute configurations:

Frontend - Create Account:

Answer 1

In \Magento\Customer\Model\Validator\Name::isValidName

Magento matches the first name of the customer with the regex pattern

private const PATTERN_NAME = '/(?:[\p{L}\p{M}\,\-\_\.\'\s\d]){1,255}+/u';

 /**
 * Check if name field is valid.
 *
 * @param string|null $nameValue
 * @return bool
 */
private function isValidName($nameValue)
{
    if ($nameValue != null) {
        if (preg_match(self::PATTERN_NAME, $nameValue, $matches)) {
            return $matches[0] == $nameValue;
        }
    }

    return true;
}

Answer 2

where can I find \Magento\Customer\Model\Validator\Name::isValidName to edit the private const PATTERN_NAME?

Regards