[php-src] Issue #7731: RecursiveRegexIterator

Issue: https://github.com/php/php-src/issues/7731 Author: WinterSilence ### Description For example, __DIR__ contain [symfony/console](https://github.com/symfony/console). ```php <?php $iterator = new RecursiveRegexIterator( new RecursiveDirectoryIterator( __DIR__, RecursiveDirectoryIterator::UNIX_PATHS), '/((?:[A-Z][a-zA-Z\d]+\/)*[A-Z][a-zA-Z\d]+)\.php$/', RegexIterator::GET_MATCH, RegexIterator::USE_KEY ); ``` Resulted in this output : Matches all class files only in root directory But I expected this output instead: Matches all class files in directory and sub-directories ### PHP Version tested only in PHP 7.3 ### Operating System _No response_