[WooCommerce Blocks] Check if the billing address contains a house number

woo-blocks-check-house-number-in-billing-address.php

<?php
add_action( 'woocommerce_store_api_checkout_update_order_from_request', 'woo_blocks_address_field_validation', 10, 2);
function woo_blocks_address_field_validation( WC_Order $order, $request ) {
    $billing_address  = $order->get_address('billing')['address_1'];
    
    if ( $billing_address && ! preg_match( '/[0-9]+/', $billing_address ) ) {
        throw new Exception( 'Your billing address must contain a house number!' );
    }
}