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@ 2013-12-12T21:11:34Z

<?php

$string1 = "aaabchr";
$string2 = "qwntfschrprtkjs";

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

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

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

48.51 ms | 402 KiB | 5 Q