<?php $string1 = "sqrtpdrt"; // matched $string2 = "qwntfschrprtkjs"; // not matched (contains chr group) $regex = '/^(?=.*[bcdfghjklmnpqrstvwxz]{4})(?!.*chr)/i'; var_dump(preg_match($regex, $string1)); var_dump(preg_match($regex, $string2));
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