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<?php $res = preg_match('/^(A{1,2}B)+$/',str_repeat('AB',8192)); if ($res === false) { var_dump(preg_last_error() == PREG_JIT_STACKLIMIT_ERROR); } ?>
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
bool(true)
Output for 5.4.0 - 5.4.40, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40

Process exited with code 139.
Output for 5.4.41 - 5.4.45
preferences:
147.6 ms | 407 KiB | 5 Q