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<?php $str = "19018216307,Public,\,k]'=system1-system2,20230914143505.5,1-050000,No"; $pattern = <<<'REGEX' ~(?nxx) (?# modifiers: - inline n: parenthesis act as non-capturing groups - inline xx: spaces are ignored even in character classes - global A: all the matches have to be contiguous ) # pattern ( (?!\A) , \K | \A ) # not at the start with a commas or at the start without [^ , \\ ]* ( \\ . [^ , \\ ]* )* # field content (all that isn't a comma nor # a backslash, or an escaped character) # check ( \z (*:END) )? # define a marker if the end of the string is reached ~A REGEX; if (preg_match_all($pattern, $str, $m) && isset($m['MARK'])) { $result = array_map(fn($s) => strtr($s, ['\\\\' => '\\', '\\' => '']), $m[0]); print_r($result); }

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