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run code in 150+ php & hhvm versions
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<?php $str = 'REXEL : Votre dossier Primexel n°@ref_dossier@ expire le @date_expiration@'; preg_match_all('/@([^@]+)@/i', $str, $matches); print_r($matches);
Output for 5.3.7 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [0] => @ref_dossier@ [1] => @date_expiration@ ) [1] => Array ( [0] => ref_dossier [1] => date_expiration ) )