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run code in 150+ php & hhvm versions
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<?php $result = preg_replace('#\[(right)\](((?R)|[^[]+?|\[)*)\[/\\1\]#siU', '', $text); var_dump($text); var_dump($result);
Output for 5.0.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: text in /in/O1tkn on line 2 Notice: Undefined variable: text in /in/O1tkn on line 3 NULL string(0) ""
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: text in /in/O1tkn on line 2 Notice: Undefined variable: text in /in/O1tkn on line 3 NULL string(0) ""