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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