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run code in 150+ php & hhvm versions
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<?php preg_match('/(?>([A-Za-z])+([A-Za-z])+)/', 'FooBar', $m); var_dump($m); preg_match('/([A-Za-z])++([A-Za-z])+/', 'FooBar', $m); var_dump($m);
based on YcV3O
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(6) "FooBar" [1]=> string(1) "a" [2]=> string(1) "r" } array(0) { }