Input values are validated using various mechanisms. let’s start by examining how you would validate input parameters in Windows PowerShell 2.0
The Inputs are validated for the below mentioned functionality
- PostalCode
- PhoneNumber
- EmailID
- IP
- FileName
Download the scripts from the below link
http://gallery.technet.microsoft.com/PowerShell-Input-Validation-30ebaa51
To validate PostalCode – 99999
Function Validate-PostalCode { Param([Parameter(Mandatory=$true,HelpMessage="Enter a valid Postal Code xxx-xxx-xxxx")][ValidatePattern("[0-9][0-9][0-9][0-9]")]$PostalCode) Write-host "The Pin Code $PostalCode is valid" }
To Validate phone number – 999-999-9999
Function validate-PhoneNumber { Param([ValidatePattern("\d{3}-\d{3}-\d{4}")]$phoneNumber) Write-host "The phone number $phoneNumber is valid" } validate-PhoneNumber -Phonenumber 999-999-9999
To Validate email address
function Validate-Email ([string]$Email) { return $Email -match "^(?("")("".+?""@)|(([0-9a-zA-Z]((\.(?!\.))|[-!#\$%&'\*\+/=\?\^`\{\}\|~\w])*)(?<=[0-9a-zA-Z])@))(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,6}))$" }
To Validate IP Range – 255.255.255.255
function Validate-IPAddress ([string]$IP) { if($IP -match "(\d{1,3}).(\d{1,3}).(\d{1,3}).(\d{1,3})" -and -not ([int[]]$matches[1..4] -gt 255)) { Write-host "The $IP IP is valid" } }
To Validate the filename for ########_???_?.jpg
function Validate-Filename { Param([ValidatePattern("^\d{8}_[a-zA-Z]{3,4}_[a-zA-Z]{1}\.jpg"]$filename) Write-host "The filename $filename is valid" }
You can also refer the below link for more information
Prashanth Jayaram 
