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<?php preg_match('#<(Password)>(.*?)</\1>#', '<Password>toto</Password>', $match); var_dump($match);
based on AQW63
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(25) "<Password>toto</Password>" [1]=> string(8) "Password" [2]=> string(4) "toto" }