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<?php $str = 'REXEL : Votre dossier Primexel n°@ref_dossier@ expire le @date_expiration@'; preg_match('/@([^@].+)@/', $str, $matches, PREG_OFFSET_CAPTURE); var_dump($matches);
Output for 5.3.7 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { [0]=> array(2) { [0]=> string(41) "@ref_dossier@ expire le @date_expiration@" [1]=> int(34) } [1]=> array(2) { [0]=> string(39) "ref_dossier@ expire le @date_expiration" [1]=> int(35) } }

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