Powershell file extension match .* - powershell

Question

I need to match the extension to ".*" to return all files in a given source folder that have the LastWriteTime of $lwt as shown in code. The user can either provide a specific extension like ".csv" but one is not provided then the script will simply search all files. But i can't match the extension with ".*" to return all files.
[CmdletBinding()]
param (
[Parameter(Mandatory=$true)][string]$source,
[Parameter(Mandatory=$true)][string]$destination,
[string]$exten=".*",
[int]$olderthandays = 30
)
$lwt = (get-date).AddDays(-$olderthandays)
if(!(Test-Path $source)){
Write-Output "Source directory does not exist."
exit
}
if(!(Test-Path $destination)){
Write-Output "Source directory does not exist."
exit
}
if($olderthandays -lt 0){
Write-Output "You can't provide a negative number of days. If you want everything deleted simply provide 0 for number of days."
exit
}
if(!$exten.StartsWith(".")){
$exten = "."+$exten
$exten
}
try{
Get-ChildItem $source -ErrorAction Stop | ?{$_.LastWriteTime -lt $lwt -AND $_.Extension -eq $exten} | foreach {
Write-Output $_.FullName
# Move-item $_.FullName $destination -ErrorAction Stop
}
}
catch{
Write-Output "Something went wrong while moving items. Aborted operation."
}
How can this be achieved ?

Answer 1

The Extension of a file will never be .*.
You could try:
$exten = "*.$exten"
Get-ChildItem $source -ErrorAction Stop -Filter $exten | ?{$_.LastWriteTime -lt $lwt} | foreach { ... }

Answer 2

Move your extension filter back into child item and use . or *.
[CmdletBinding()]
param
(
[Parameter(Mandatory=$true)][string]$source,
[Parameter(Mandatory=$true)][string]$destination,
[string]$exten="*.*",
[int]$olderthandays = 30
)
$lwt = (get-date).AddDays(-$olderthandays)
if(!(Test-Path $source)){
Write-Output "Source directory does not exist."
exit
}
if(!(Test-Path $destination)){
Write-Output "Source directory does not exist."
exit
}
if($olderthandays -lt 0){
Write-Output "You can't provide a negative number of days. If you want everything deleted simply provide 0 for number of days."
exit
}
if(!$exten.StartsWith('*.')){
$exten = "*."+$exten
$exten
}
try{
Get-ChildItem $source -Filter $exten -ErrorAction Stop | ?{$_.LastWriteTime -lt $lwt} | foreach {
Write-Output $_.FullName
# Move-item $_.FullName $destination -ErrorAction Stop
}
}
catch{
Write-Output "Something went wrong while moving items. Aborted operation."
}