Filter WooCommerce SKU Value by Replacing Text

/**
 * Filter WooCommerce SKU Value Filter
 *
 * Add / in SKU number.
 *
 * @package WPDataSync
 */

add_filter( 'wp_data_sync__sku_value', 'wp_data_sync__sku_value', 10, 3 );

/**
 * WP Data Sync _sku Filter
 *
 * @param $_sku
 * @param $post_id
 * @param $data_sync
 *
 * @return mixed
 */

function wp_data_sync__sku_value( $_sku, $post_id, $data_sync ) {

	if ( ! empty( $_sku ) && FALSE !== strpos( $_sku, 'BCO' ) ) {
		// Add markup to price
		$_sku = str_replace( 'BCO', '/BCO', $_sku );
	}

	return $_sku;
}