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run code in 150+ php & hhvm versions
Bugs & Features
<?php $data = '$MyProfile_pages:synergiq_trk_user'; preg_match("/^\$((([\w\.-]+):)?((\w+):))?(\w+)$/", "",$data); print_r($matches); echo "\n";
Output for 5.0.4 - 7.1.0
Notice: Undefined variable: matches in /in/nooU6 on line 4
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: matches in /in/nooU6 on line 4