How can Umlaut characters [ä,ü,ö] be included in email address validation in PHP?

Umlaut characters [ä,ü,ö] can be included in email address validation in PHP by using the mb_ functions to handle multibyte characters. This involves converting the email address to UTF-8 encoding before performing validation. This ensures that Umlaut characters are properly recognized and validated in email addresses. 

function validateEmail($email) {
    if (mb_ereg_match('^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$', mb_convert_encoding($email, 'UTF-8'))) {
        return true;
    } else {
        return false;
    }
}

$email = "test@example.com";
if (validateEmail($email)) {
    echo "Email address is valid.";
} else {
    echo "Email address is invalid.";
}

Keywords

PHP Umlaut characters email address validation regex mbstring.

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