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run code in 150+ php & hhvm versions
Bugs & Features
<?php $str = "PDOConnectionFactoryDB7"; $upper = '[A-Z]'; $lower = '[a-z]'; $numeric = '[0-9]'; $regex = "(^({$upper}{$lower}+" /* <-- Connection and Factory */ . "|{$upper}+(?!{$upper})" /* <-- PDO and DB */ . "|{$numeric}+" /* <-- 7 */ .")$)"; preg_match_all($regex, $str, $matches); var_dump($matches);
Output for 4.3.0 - 7.1.0
array(2) { [0]=> array(0) { } [1]=> array(0) { } }