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Passing a function to Powershell's (replace) function

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.

Something like -

$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

like image 843
Swapnil Avatar asked Nov 17 '11 06:11

Swapnil


1 Answers

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.

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

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

Output:

zzz string-match-1 string-match-2 xxx
like image 170
Roman Kuzmin Avatar answered Oct 06 '22 16:10

Roman Kuzmin