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<?php $search = 'FirstName LastName'; preg_match('/^([a-z]*)\s*([a-z]*)$/i', trim($search), $matches); var_dump($matches);
Output for 5.3.0 - 7.1.0
array(3) { [0]=> string(18) "FirstName LastName" [1]=> string(9) "FirstName" [2]=> string(8) "LastName" }