Operator precedence. Basically there is none. It’s all left to right. So the or (|) is applying to the closing quote lookahead and the comma lookahead
Try:
(?:(?<=")([^"]*)(?="))|(?<=,|^)([^,]*)(?=,|$)
Operator precedence. Basically there is none. It’s all left to right. So the or (|) is applying to the closing quote lookahead and the comma lookahead
Try:
(?:(?<=")([^"]*)(?="))|(?<=,|^)([^,]*)(?=,|$)