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run code in 200+ php & hhvm versions
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<?php $string="1001-sdfjh"; $matches=array(); preg_match("/^(\d{4})-([A-Za-z0-9])/", $string, $matches); print_r($matches); ?>
Output for 4.3.0 - 7.2.0
Array ( [0] => 1001-s [1] => 1001 [2] => s )