powershell special character user input validation

Question

I am wanting to validate a user's input of special characters and if the characters are not correct, I want it to loop back to the read-host statement. I am unsure what loop type I should use and how to do this. Any and all help would be greatly appreciated.

For example

$Example = Read-Host “Input one of the following symbols 
Addition (+)
Subtraction (-)
Multiplication (*)
Division (/)"

colsw · Accepted Answer · 2017-10-11 22:00:30Z

0

Something like this should suit your needs.

do {
    $Symbol = Read-Host 'Symbol'
    if ($Symbol -match '^(\+|-|\*|/)$'){
        $Valid = $true
    } else {
        Write-Host "'$($Symbol)' is not a valid input, please choose one of +,-,* or /"
        $Valid = $false
    }
} while (!$Valid)

answered Oct 11, 2017 at 22:00

colsw

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1 Comment

RKS Over a year ago

Thank you so much, I really appreciate the help.

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