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