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HomeBackend DevelopmentGolangFound an error in Golang Regexp ReplaceAllString?

Found an error in Golang Regexp ReplaceAllString?

Feb 13, 2024 pm 03:51 PM
golang development

Golang Regexp ReplaceAllString 中发现错误?

在Golang开发过程中,使用正则表达式进行字符串替换是常见的操作。然而,有时候在使用ReplaceAllString函数时可能会遇到一些错误。php小编柚子在这里为大家解答这个问题,帮助大家理解并解决Golang Regexp ReplaceAllString中可能出现的错误。无论是初学者还是有经验的开发者,在使用正则表达式进行替换时,都可能遇到一些棘手的问题。下面我们将深入探讨这个问题,并提供一些解决方案,希望能够帮助到大家。

问题内容

package main

import (
    "fmt"
    "regexp"
)

const sample = `darted`

func main() {
    var re = regexp.MustCompile(`^(.*?)d(.*)$`)
    s := re.ReplaceAllString(sample, `$1c$2`)
    fmt.Println(s)//prints 'arted' expected: carted
}

去游乐场:https://go.dev/play/p/-f0cd_81emx

尝试使用非字母字符有效(即“$1.$2”会产生“.arted”)

添加多个字母字符是可行的(即“$1cl$2”会导致“clarted”)

为什么上面的示例不起作用?

有人可以告诉我我做错了什么,或者确认这是 go 中需要报告的错误吗?

解决方法

在你的替代品中:

`$1c$2`

这被解释为字面名为 $1c 的捕获组,该捕获组在正则表达式中不存在。您需要 ${1}c

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