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js正则表达式replace记忆内匹配。

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js正则表达式replace记忆内匹配。

image.png

为什么在""内非0的不能被匹配


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一个正则表达式模式使用括号，将导致相应的子匹配被记住。但第二条正则的父匹配并没有被匹配上，所以也无相应的子匹配了


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