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<?php $str = 'e ,a\\,b\\\\,c\\\\\\,d\\\\'; preg_match_all('/(?<!(?<!\\\\)\\\\),/', $str, $matches); var_dump($matches[0]);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> string(1) "," [1]=> string(1) "," [2]=> string(1) "," }

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