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<?php $matches=array(); $string = 'This is a [templateVar]'; preg_match_all("^[^T]/", $string, $matches); var_dump($matches);
based on Cv2ak
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match_all(): Unknown modifier 'T' in /in/AvCcV on line 5 array(0) { }
Output for hhvm-3.12.0
Warning: Unknown modifier 'T': [^[^T]/] in /in/AvCcV on line 5 array(0) { }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier 'T' in /in/AvCcV on line 5 array(0) { }