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run code in 300+ PHP versions simultaneously
<?php $result = preg_replace('~\[(img|url)\](.*)\[/\1\]~i', 'REPLACED', '[img]test[/img][not]img[/not][url]http][/url][img]second image[/img]'); echo $result;

preferences:
32.8 ms | 404 KiB | 5 Q