Increase Substring length dynamically - powershell

Question

I am new to the community and need some help in Powershell.
I want the following code to dynamically check if the specific $sAMAccountName exists in an array or not.
If it exists, keep increasing the substring length by 1 and check the array again.
Instead of defining more variables like $sAMAccountName1 and $sAMaccountName2 (and so on) manualy.
$Nachname = "Nachname"
$Vorname = "Vorname"
$sAMAccountName = $Nachname+$Vorname.Substring(0,1)
$sAMAccountName1 = $Nachname+$Vorname.Substring(0,2)
$sAMAccountName2 = $Nachname+$Vorname.Substring(0,3)
$Array = #('NachnameV','NachnameVo','NachnameVor')
if($sAMAccountName -notin $Array){
Write-Host "$sAMAccountname does not exist :-)"
}
elseif($sAMAccountName1 -notin $Array){
Write-Host "$sAMAccountName1 does not exist :-)"
}
elseif($sAMAccountName2 -notin $Array){
Write-Host "$sAMAccountName2 does not exist :-)"
}
else{
Write-Host "$sAMAccountName2 does exist :-("
}
Thank you for your help.
Greetings,
PalimPalim

Answer 1

This may do what you need :
$Nachname = "Nachname"
$Vorname = "Vorname"
#$sAMAccountName = $Nachname+$Vorname
$Array = #('NachnameV','NachnameVo','NachnameVor')
$i = 0
do {
$i++
$sAMAccountName = $Nachname+$Vorname.Substring(0,$i)
write-host "i = $i"
write-host "account name = $sAMAccountName"
if($sAMAccountName -in $Array){
Write-Host "$sAMAccountName found"
}
} until ($sAMAccountName -notin $array)
Write-Host "$($Nachname+$Vorname.Substring(0,$i)) not found"
Where $i is used as an index which increases by 1 within the do until loop until the name being searched for no longer shows up in the array.
The write-host lines for i=$i and the account name aren't needed, but just let you see what the script is doing on each iteration round the loop, and can be removed.