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run code in 150+ php & hhvm versions
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<?php preg_match('#<Password>(.*?)</\1>#', '<Password>toto</Password>', $match); var_dump($match);
based on 0Y95Z
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(0) { }