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run code in 150+ php & hhvm versions
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<?php $string1 = "sqrtpdrt"; // matched $string2 = "qwntfschrprtkjs"; // not matched (contains chr group) var_dump(preg_match('/[bcdfghjklmnpqrstvwxz]{4}/i', $string1 )); var_dump(preg_match('/[bcdfghjklmnpqrstvwxz]{4}/i', $string2 ));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
int(1) int(1)