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run code in 150+ php & hhvm versions
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<?php preg_match("~^\w+$~", "moduke_name",$matches); print_r($matches); echo "\n"; preg_match("/(\w*)/", "",$matches); print_r($matches);
Output for 4.3.0 - 7.1.0
Array ( [0] => moduke_name ) Array ( [0] => [1] => )