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<?php preg_match('/a{3}(*SKIP:MARK_A)c/', 'aaaac', $matches); var_dump($matches);
Output for 5.3.4 - 7.1.0
array(1) { [0]=> string(4) "aaac" }
Output for 5.2.5 - 5.3.3
Warning: preg_match(): Compilation failed: (*VERB) with an argument is not supported at offset 10 in /in/8C7Wd on line 2 NULL
Output for 5.2.0 - 5.2.4
Warning: preg_match(): Compilation failed: nothing to repeat at offset 5 in /in/8C7Wd on line 2 NULL
Output for 4.3.11 - 4.4.8, 5.0.0 - 5.1.6
Warning: preg_match(): Compilation failed: nothing to repeat at offset 5 in /in/8C7Wd on line 2 array(0) { }
Output for 4.4.9
Warning: preg_match(): Compilation failed: (*VERB) with an argument is not supported at offset 10 in /in/8C7Wd on line 2 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: nothing to repeat at offset 5 in /in/8C7Wd on line 2 array(0) { }