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@ 2013-12-16T15:58:51Z

<?php

$formula = "B2/@A14";
$pattern = '#@([A-Z][\d])#';

preg_match_all($pattern,$formula,$matches);
var_dump($matches);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match_all: documentation ( source)

preferences:dark modelive preview

42.42 ms | 402 KiB | 5 Q