ProductsAmountProvider.php

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<?php
namespace Magento\Setup\Fixtures;

use Magento\Catalog\Model\ResourceModel\Product\CollectionFactory;

class ProductsAmountProvider
{
    private $productCollectionFactory;

    public function __construct(CollectionFactory $collectionFactory)
    {
        $this->productCollectionFactory = $collectionFactory;
    }

    public function getAmount($requestedProducts, $productSkuPattern)
    {
        $productSkuPattern = str_replace('%s', '[0-9]+', $productSkuPattern);
        $productCollection = $this->productCollectionFactory->create();
        $productCollection
            ->getSelect()
            ->where('sku ?', new \Zend_Db_Expr('REGEXP \'^' . $productSkuPattern . '$\''));

        return max(0, $requestedProducts - $productCollection->getSize());
    }
}