How To Change the Default “Add To Cart” Button Text in WooCommerce

// Disable search in WordPress - More snippets at wpunplugged.com 

add_filter('woocommerce_product_single_add_to_cart_text', 'woo_custom_cart_button_text');
 
function woo_custom_cart_button_text() {
return __('Book Now', 'woocommerce');
}