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golang正则表达式如何成对匹配并且替换

如题,想要达成效果如下
原字符串 [内容] (xxxx)
结果字符串 http://xxxx/内容

原字符串中可能存在多个符合 []()格式的信息,希望能够全部替换掉


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package main

import (
    "regexp"
    "fmt"
)

func main() {
    var re = regexp.MustCompile(`(?m)[([^[]]+)]s*(([^()]+))`)
    var str = `[内容] (xxxx)`
    var substitution = "http://$2/$1"
    
    fmt.Println(re.ReplaceAllString(str, substitution))
}

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