douzhouhan4618 2015-07-28 14:53
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带有反向引用的golang regexp ReplaceAllStrings不太起作用

Trying to capitalize each letter at begin of the word. I know that there is strings.Title, but that is too imprecise for my needs.

I am not sure why this does not work:

package main

import (
    "fmt"
    "regexp"
    "strings"
)

func main() {
    re := regexp.MustCompile(`\b([a-z])`)
    fmt.Println(re.ReplaceAllString("my test string", strings.ToUpper("$1")))

}

https://play.golang.org/p/C-8QG1FrOi

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1条回答 默认 最新

  • dongpao1926 2015-07-28 15:03
    关注

    You should use ReplaceAllStringFunc, example:

    re.ReplaceAllStringFunc("my test string", func(s string) string {
                                              return strings.ToUpper(s)})
    

    See working demo.

    Your code doesn't work because:

    re.ReplaceAllString("my test string", strings.ToUpper("$1"))
    

    is the same as:

    re.ReplaceAllString("my test string", "$1")
    

    since the upper case of $1 is still $1.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

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