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<?php $formula = "B2/@A14 * 12"; $pattern = '#@([A-Z][\d]+)#'; preg_match_all($pattern,$formula,$matches); var_dump($matches);
Output for 4.3.0 - 7.1.0
array(2) { [0]=> array(1) { [0]=> string(4) "@A14" } [1]=> array(1) { [0]=> string(3) "A14" } }