正则达表达替换内容弄不出来

我想用Visual Studio Code查找替换内容，把括号内的第三组数字和他前面的逗号去掉

原文
[[24.422795,118.13635,20.969378],[24.422815,118.136474,20.413858],[24.422856,118.136606,20.510939]]

想要的内容
[[24.422795,118.13635],[24.422815,118.136474],[24.422856,118.136606]]

/(\[\d+?\.\d+,\d+?\.\d+),\d+?\.\d+\]/g

'[[24.422795,118.13635,20.969378],[24.422815,118.136474,20.413858],[24.422856,118.136606,20.510939]]'.replace(/(\[\d+?\.\d+,\d+?\.\d+),\d+?\.\d+\]/g, '$1]')

// '[[24.422795,118.13635],[24.422815,118.136474],[24.422856,118.136606]]'