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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[0]);
based on p5mLV
Output for 4.3.0 - 7.1.0
array(3) { [0]=> string(1) "a" [1]=> string(6) "b\,c\\" [2]=> string(1) "d" }