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run code in 150+ php & hhvm versions
Bugs & Features
<?php $str = 'a\\\\\\,b\\\\,c\\,d'; preg_match_all('/(?:[^\\\\,]|\\\\.)+(?<=,|$)/',$str,$matches); var_dump($matches);
based on fpRA6
Output for 4.3.0 - 7.1.0
array(1) { [0]=> array(2) { [0]=> string(5) "a\\\," [1]=> string(6) "\,c\,d" } }