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<?php $formula = "B2/@A14"; $pattern = '#@([A-Z][\d])#'; preg_match_all($pattern,$formula,$matches); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> array(1) { [0]=> string(3) "@A1" } [1]=> array(1) { [0]=> string(2) "A1" } }

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