3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $string1 = "aaabchr"; $string2 = "qwntfschrprtkjs"; $regex = '/^(?:.(?!chr))*(?:[bcdfghjklmnpqrstvwxz](?!chr)){4}(?:.(?!chr))*$/i'; var_dump( preg_match($regex, $string1), preg_match($regex, $string2) );
Output for 4.3.0 - 7.2.0
int(0) int(0)