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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 eqKvQ
Output for 5.2.0 - 7.1.0
Warning: preg_match(): Compilation failed: missing ) at offset 25 in /in/YcV3O on line 3 NULL array(0) { }
Output for 4.3.11 - 5.1.6
Warning: preg_match(): Compilation failed: missing ) at offset 25 in /in/YcV3O on line 3 array(0) { } array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: missing ) at offset 25 in /in/YcV3O on line 3 array(0) { } array(0) { }