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@ 2013-12-12T20:50:40Z

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

var_dump(preg_match('/[bcdfghjklmnpqrstvwxz]{4}/i', $string1 ));
var_dump(preg_match('/[bcdfghjklmnpqrstvwxz]{4}/i', $string2 ));

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

29.35 ms | 402 KiB | 5 Q