将函数传递给Powershell的（替换）函数

I want to pass a function call(which returns a string) as a replacement string to Powershell's replace function such that each match found is replaced with a different string.

我想将函数调用（返回一个字符串）作为替换字符串传递给Powershell的替换函数，以便找到的每个匹配项都替换为不同的字符串。

Something like -

就像是 -

$global_counter = 0
Function callback()
{
    $global_counter += 1   
    return "string" + $global_counter
}

$mystring -replace "match", callback()

Python allows this through 're' module's 'sub' function which accepts a callback function as input. Looking for something similar

Python允许通过're'模块的'sub'函数接受回调函数作为输入。寻找类似的东西

2 个解决方案

#1

Perhaps you are looking for Regex.Replace Method (String, MatchEvaluator). In PowerShell a script block can be used as MatchEvaluator. Inside this script block $args[0] is the current match.

也许您正在寻找Regex.Replace方法（String，MatchEvaluator）。在PowerShell中，脚本块可以用作MatchEvaluator。在这个脚本块中，$ args [0]是当前匹配。

$global_counter = 0
$callback = {
    $global_counter += 1
    "string-$($args[0])-" + $global_counter
}

$re = [regex]"match"
$re.Replace('zzz match match xxx', $callback)

Output:

输出：

zzz string-match-1 string-match-2 xxx

#2

PowerShell does not (yet?) have support for passing a script block to the -replace operator. The only option here is to use [Regex]::Replace directly:

PowerShell（但是？）不支持将脚本块传递给-replace运算符。这里唯一的选择是直接使用[Regex] :: Replace：

[Regex]::Replace($mystring, 'match', {callback})

#1