Validate phone number in WooCommerce

I would like to add custom validation to the phone number (billing_phone) on the checkout page and the register page.

• With 05
• Accept 10 numbers

Validate phone number in woocommerce checkout page

Answer

Just Check I hope it works

add_filter('woocommerce_process_registration_errors','custom_validate_billing_phone',10, 4 )
add_action( "woocommerce_after_save_address_validation",'custom_validate_billing_phone',1,2);
    add_action('woocommerce_checkout_process', 'custom_validate_billing_phone');
        function custom_validate_billing_phone() {
            $is_correct = preg_match('/^05[0-9]{8}$/', $_POST['billing_phone']);
            if ( $_POST['billing_phone'] && !$is_correct) {
                wc_add_notice( __( 'The Phone field should be <strong>start 05 and 10 digits</strong>.' ), 'error' );
         }
    }