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run code in 150+ php & hhvm versions
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<?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 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match_all(): Unknown modifier '$' in /in/b32RM on line 13 NULL
Output for hhvm-3.10.0 - 3.12.0
Warning: Unknown modifier '$': [(^[A-Z][a-z]+|[A-Z]+(?![A-Z])|[0-9]+)$] in /in/b32RM on line 13 NULL
Output for 4.3.11 - 5.1.6
Warning: preg_match_all(): Unknown modifier '$' in /in/b32RM on line 13 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '$' in /in/b32RM on line 13 array(0) { }