[php-src] Issue #7950: preg_match fails to match zero

Issue: https://github.com/php/php-src/issues/7950 Author: Adam2Marsh ### Description The following code: ```php <?php $value=0.0; preg_match("/(\d+)\.(\d+)/",$value, $matches); print_r($matches); ``` Resulted in this output: ``` Array ( ) ``` But I expected this output instead: ``` Array ( [0] => 0.0 [1] => 0 [2] => 0 ) ``` I found this as in my code I need to strip the numbers off the decimal point, now sometimes that decimal point might just be a 0 and my regex failed to match. As soon as I change the last number to be any number then it works. The first number can be anything, that doesn't matter. I even tried the following regex patterns and still wouldn't match ``` "/\d+\.(\d+)&/" "/\.(\d+)/" "/\.(\d+)&/" ``` Php Version: ``` php -v PHP 8.1.1 (cli) (built: Jan 9 2022 20:13:47) (NTS) Copyright (c) The PHP Group Zend Engine v4.1.1, Copyright (c) Zend Technologies with Zend OPcache v8.1.1, Copyright (c), by Zend Technologie ``` Running on osx m1 Mac, any ideas? ### PHP Version 8.1.1 ### Operating System m1 osx 12.0.1