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@ 2013-12-12T21:00:00Z

<?php
$string1 = "sqrtpdrt"; // matched
$string2 = "qwntfschRprtkjs"; // not matched (contains chr group) 

$regex = '/^(?=(?i).*[bcdfghjklmnpqrstvwxz]{4})(?!.*chr)/';

var_dump(preg_match($regex, $string1));
var_dump(preg_match($regex, $string2));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive preview

37.24 ms | 402 KiB | 5 Q