How to add custom username validation logic?

Table of content

How to add custom username validation logic?

Documentation

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For developers

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Guides

You can add custom validation to the entered username using the nsl_validate_username filter.

Example

Code

add_filter('nsl_validate_username', function ($isValid, $username, $errors) {
    if (strlen($username) < 6) { $errors->add('invalid_username', '' . __('ERROR') . ':' . __('Sorry, username must contain at least 6 characters.'));
        $isValid = false;
    }
    return $isValid;
}, 10, 3);

Available since: 3.0.7