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run code in 150+ php & hhvm versions
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<?php $str = 'e ,a\\,b\\\\,c\\\\\\,d\\\\, f'; preg_match_all('/(?:[^\\\\,]|\\\\(?:.|$))+/', $str, $matches); var_dump($matches[0]);
based on 1e8I8
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(2) "e " [1]=> string(6) "a\,b\\" [2]=> string(8) "c\\\,d\\" [3]=> string(2) " f" }