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run code in 150+ php & hhvm versions
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<?php $var = array('40_'); if (preg_match('/^\d{1,}_$/', reset($var), $match)) { var_dump($match); }
based on Q2QIB
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> string(3) "40_" }