<?php $input = 'S1G5AB'; // given this $store = '5I6GAB'; // actually this $chars = str_split($input); var_dump($chars); $regex = str_replace(['S','5','G','6','1','I'], ['[S5]','[S5]','[G6]','[G6]','[I1]','[I1]'], $input); echo $regex; echo (0 < preg_match("/$regex/", $store) ? 'Match' : 'No match');
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