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run code in 150+ php & hhvm versions
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<?php $str = 'a\\\\\\,b\\\\,c\\,d'; preg_match_all('/(?:(?:\\\\.))+(?<=,|$)/',$str,$matches); var_dump($matches);
based on t9OmC
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> array(3) { [0]=> string(4) "\\\," [1]=> string(2) "\," [2]=> string(2) "\," } }
Output for hhvm-3.10.0

Process exited with code 153.