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run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(preg_match('[.[[[]].]', 'foo42[ba]rl[]ol', $m), $m);
based on HrOig
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): No ending matching delimiter ']' found in /in/VbUOC on line 2 bool(false) NULL
Output for hhvm-3.12.0
Warning: No ending matching delimiter ']' found: [[.[[[]].]] in /in/VbUOC on line 2 bool(false) NULL
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.11 - 5.1.6
Warning: preg_match(): No ending matching delimiter ']' found in /in/VbUOC on line 2 bool(false) array(0) { }
Output for 4.3.0 - 4.3.10
Warning: No ending matching delimiter ']' found in /in/VbUOC on line 2 bool(false) array(0) { }