[php-src] Issue #7730: RecursiveRegexIterator

Issue: https://github.com/php/php-src/issues/7730 Comment Author: iluuu1994 @WinterSilence So the way it works is the regex is applied in each iteration to each directory before it is eventually applied to the file. ``` - foo - foo.php - bar - bar.php ``` The iterator will first filter directories foo and bar by \.php$ which will already exclude both of them. You could do something like (/\.)|(\.php)$ to allow any directory but that means all directories will be in your result set and you'll once again have to filter them out. I suggest using [this](https://github.com/php/php-src/issues/7730#issuecomment-987849203) approach. RecursiveRegexIterator probably works as expected, although its usefulness is questionable. [There are only 21 usages](https://grep.app/search?q=new%20%28%5C%5C%3F%29RecursiveRegexIterator&regexp=true) of this class on GitHub.