Restrict numbers from being used in the first and last name fields on checkout in WooCommerce

HowTo Code Snippets
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Restrict numbers from being used in the first and last name fields on checkout in WooCommerce on child sites.

Snippet Type

Execute on Child Sites

Snippet

add_action('woocommerce_after_checkout_validation', function ( $fields, $errors ) {

    if (!preg_match('/^[a-zA-Z]+$/', $fields['billing_first_name'])) {
        $errors->add('billing_first_name', 'First name must contain only alphabetic characters');
    }

    if (!preg_match('/^[a-zA-Z]+$/', $fields['billing_last_name'])) {
        $errors->add('billing_last_name', 'Last name must contain only alphabetic characters');
    }
}, 10, 2);
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