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正则表达式-大小写转换的问题

想直接利用正则实现大小写转换,但 U、L 这样的表达式在 js 中没有效果?对 idea 这样的替换工具是有用的。

"foo_bar".replace(/(_)([a-z]{1})/,"U$2")
--> "fooUbar"

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"foo_bar".replace(/_([a-z]{1})/,function(s,s1){return s1.toUpperCase()})

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