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run code in 150+ php & hhvm versions
Bugs & Features
<?php $s = '%1.%2.%3'; preg_match('~(%[0-9]+.)~', $s, $m); var_dump($m);
based on glfNB
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(3) "%1." [1]=> string(3) "%1." }
Output for hhvm-3.10.0

Process exited with code 153.