Okay in one of my scripts I needed to incorporate user input of an IP address and to validate the input as valid IPv4 address. Take a look at the snippet below
<#IP Validation Pattern#>
$IPPattern = '^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$'
<#User Input of IP #>
Write-Host "Please Enter IP: " -ForegroundColor Yellow -NoNewline
<#Input Loop Until Validation meets pattern#>
do {
<# Set IP address var #>
$IPADR = Read-Host
$ok = $IPADR -match $IPPattern
if ($ok -eq $false) {
<# Error Message and Prompt to enter an IP #>
Write-Warning ("'{0}' is not an IP address." -f $IPADR)
write-host -fore Yellow "Please Enter IP: " -NoNewline
}
<#Condition#>
} until ( $ok )
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