I have the following string
$FileNamePattern = 'blah_{4}_{5}_blah_{4}-{2}.CSV'
and I want to replace the numbers in the curly braces with a string of question marks, n characters long
As an example I would like it to return 'blah_????_?????_blah_????-??.CSV'
I have this so far, but can't seem to get the 'expansion' in the replace working
[regex]::Replace($FileNamePattern,'{(\d+)}','"?"*$1')
Any help would be greatly appreciated!
Matthew
You need to do the processing of the match inside a callback method:
$callback = { param($match) "?" * [int]$match.Groups[1].Value }
$FileNamePattern = 'blah_{4}_{5}_blah_{4}-{2}.CSV'
$rex = [regex]'{(\d+)}'
$rex.Replace($FileNamePattern, $callback)
The regex {(\d+)} matches { and } and captures 1+ digits in between. The submatch is parsed as an integer inside the callback (see [int]$match.Groups[1].Value) and then the ? is repeated that amount of times with "?" * [int]$match.Groups[1].Value.
