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<?php preg_match_all("/([0-9]+)(?:\[(.*)\])?A/", "123[SomeText]A345[SomeOtherText]A678A", $matches); print_r($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [0] => 123[SomeText]A345[SomeOtherText]A [1] => 678A ) [1] => Array ( [0] => 123 [1] => 678 ) [2] => Array ( [0] => SomeText]A345[SomeOtherText [1] => ) )
Output for hhvm-3.10.0

Process exited with code 153.