- var_dump: documentation ( source)
- preg_match_all: documentation ( source)
<?php declare(strict_types = 1);
preg_match_all('/(ERR)?.+/', 'abc', $results, PREG_SET_ORDER);
var_dump($results);
preg_match_all('/(ERR)?(.+)/', 'abc', $results, PREG_SET_ORDER);
var_dump($results);