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<?php $regex = '/(((?!a).)*)*a\\{/u'; $test_string = 'AAAAAAAAAAAAAA{AA'; echo mb_ereg_replace($regex,'WORKED',$test_string); echo "\n"; var_dump(preg_match($regex,$test_string));
Output for 4.3.4 - 4.4.5, 4.4.9 - 5.2.1, 5.2.4 - 5.3.3, hhvm-3.12.0, 7.0.0 - 7.1.0
AAAAAAAAAAAAAA{AA int(0)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.4 - 5.6.28
AAAAAAAAAAAAAA{AA bool(false)
Output for 4.4.6 - 4.4.8, 5.2.2 - 5.2.3
AAAAAAAAAAAAAA{AA
Process exited with code 139.
Output for 4.3.2 - 4.3.3
Fatal error: Call to undefined function: mb_ereg_replace() in /in/P7NSh on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: mb_ereg_replace() in /in/P7NSh on line 4