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<?php $s = "AAA"; preg_match('/A+A/', $s, $m); var_dump($m); preg_match('/A+?A/', $s, $m); var_dump($m); preg_match('/A++A/', $s, $m); var_dump($m);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(1) { [0]=> string(3) "AAA" } array(1) { [0]=> string(2) "AA" } array(0) { }

preferences:
238.61 ms | 405 KiB | 310 Q