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run code in 150+ php & hhvm versions
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<?php $str = 'a\\,b\\\\,c\\\\\\,d\\\\'; preg_match_all('/(?:[^\x5c,]|\x5c(?:.|$))+/', $str, $matches); var_dump($matches[0]);
based on jadWU
Output for 4.3.0 - 7.1.0
array(2) { [0]=> string(6) "a\,b\\" [1]=> string(8) "c\\\,d\\" }