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<?php $formula = 'IF(B15="","",IF(ISNUMBER(A14),A14+1,IF(ISNUMBER(B3),B3+1,1)))'; echo preg_replace_callback('/\b([A-Z])(\d+)\b/', function ($m) { return $m[1] . (1 + $m[2]); }, $formula);
Output for git.master, git.master_jit, rfc.property-hooks
IF(B16="","",IF(ISNUMBER(A15),A15+1,IF(ISNUMBER(B4),B4+1,1)))

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