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run code in 200+ php & hhvm versions
Bugs & Features
<?php $subject = "#<LEFT_KEYs"; echo preg_match('/^#([\!,\<,\>,\=,\%])?([a-z,_]*[\.]?)?([A-Z,_]+)$/', $subject);
Output for 4.3.0 - 7.1.7
0