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<?php $array = array(); echo preg_match('/?!([\d]+\.[\d]+\.[\d]+)/', '5.5.5-pl-udmedia', $array); var_dump($array);
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Compilation failed: nothing to repeat at offset 0 in /in/tRlrh on line 4 array(0) { }
Output for 4.3.0 - 4.3.10, hhvm-3.10.0 - 3.12.0
Warning: Compilation failed: nothing to repeat at offset 0 in /in/tRlrh on line 4 array(0) { }