Powershell input checking - powershell

Question

I would like to check the input option is allow 1-3 number ONLY, and input other numbers and characters will show the warning message, how to do that?
Can I check the input user account [value] from AD user is whether exist or not on Powershell? If the record not exist, just return the warning message.
Please help. Thanks!
import-module ActiveDirectory
import-module C:\PS\color_menu.psm1
CreateMenu -Title "AD User Account Expire Tools" -MenuItems "View the User Account Expire Date","Set the User Account Expire Date","Exit" -TitleColor Red -LineColor Cyan -menuItemColor Yellow
do {
[int]$userMenuChoice = 0
while ( $userMenuChoice -lt 1 -or $userMenuChoice -gt 3) {
Write-Host "1. View the User Account Expire Date"
Write-Host "2. Set the User Account Expire Date"
Write-Host "3. Exit"
[int]$userMenuChoice = Read-Host "Please choose an option"
switch ($userMenuChoice) {
1{$useraccount = Read-Host -prompt "Please input an user account"
Get-ADUser -Identity $useraccount -Properties AccountExpirationDate | Select-Object -Property SamAccountName, Name, AccountExpirationDate
Write-Host "";
Write-Host "";
}
2{$useraccount = Read-Host -prompt "Please input an user account"
do {
$expiredatetimeStr = Read-Host -prompt "Please input the user expiration date and time (DateFormat: MM/dd/yyyy) or just press Enter to make the account non-expiring"
if ($expiredatetime = $expiredatetimeStr -as [datetime]) {
Set-ADAccountExpiration -Identity $useraccount -DateTime $expiredatetime
Get-ADUser -Identity $useraccount -Properties AccountExpirationDate | Select-Object -Property SamAccountName, Name, AccountExpirationDate
Write-Host "";
Write-Host "";
}
elseif ($expiredatetimeStr.Trim() -eq '') {
Clear-ADAccountExpiration -Identity $useraccount
Get-ADUser -Identity $useraccount -Properties AccountExpirationDate | Select-Object -Property SamAccountName, Name, AccountExpirationDate
Write-Host "";
Write-Host "";
}
else {
Write-Warning 'Please enter a valid date.'
continue
}
break
} while ($true)
}
3{Write-Host "Exit";Exit
}
default {Write-Host "Incorrect input" -ForegroundColor Red
Write-Host "";
Write-Host "";
}
}
}
} while ( $userMenuChoice -ne 3 )

Answer 1

The problem is that you are directly casting a user input to an int:
$a = [int] Read-Host
What if the return value of Read-Host isn't an int?
The solution is to just accept whatever Read-Host gives you, and check the value after, e.g:
$a = Read-Host
try {
$intVal = [Convert]::ToInt32($a, 10)
... etc ...
}
catch {
... etc ...
}