MAGETWO-67871: Requesting autogenerated classes that are not in constructor cause fatal errors in production mode

- add RegexIteratorFactory

Author: Igor Melnikov

lib/internal/Magento/Framework/App/Utility/RegexIteratorFactory.php

@@ -0,0 +1,26 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\Framework\App\Utility;
+
+/**
+ * Factory for \RegexIterator
+ */
+class RegexIteratorFactory
+{
+    /**
+     * Create instance of \RegexIterator
+     *
+     * @param string $directoryPath
+     * @param string $regexp
+     * @return \RegexIterator
+     */
+    public function create($directoryPath, $regexp)
+    {
+        $directory = new \RecursiveDirectoryIterator($directoryPath);
+        $recursiveIterator = new \RecursiveIteratorIterator($directory);
+        return new \RegexIterator($recursiveIterator, $regexp, \RegexIterator::GET_MATCH);
+    }
+}