Ptt 大爆卦 | backus-naur form - 前往 https://cs.stackexchange.com/questions/153573/what-role-does-an-asterisk-serve-in-backus-naur-normal-form

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What role does an asterisk serve in Backus–Naur Normal Form?

I have never seen this syntax before, but most likely, <var-def*> is a typo for (or unusual way of writing) <var-def>* .

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