Golang正则表达式替换字符串

我有以下可能形式的字符串:

MYSTRING=${MYSTRING}\n
MYSTRING=\n
MYSTRING=randomstringwithvariablelength\n

MYSTRING=fooMYSTRING=\n

re := regexp.MustCompile("MYSTRING=*\n")
s = re.ReplaceAllString(s, "foo")

但它不起作用.任何帮助表示赞赏.

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1> Wiktor Strib..：

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你可以用

(MYSTRING=).*

${1}foo

(MYSTRING=).*MYSTRING=${1}.*

参见Go演示:

package main

import (
    "fmt"
    "regexp"
)

const sample = `MYSTRING=${MYSTRING}
MYSTRING=
MYSTRING=randomstringwithvariablelength
`
func main() {
    var re = regexp.MustCompile(`(MYSTRING=).*`)
    s := re.ReplaceAllString(sample, `${1}foo`)
    fmt.Println(s)
}

输出:

MYSTRING=foo
MYSTRING=foo
MYSTRING=foo