As Brien demonstrates, string validation is not the only type of input validation that PowerShell can perform.

PowerShell How-To Getting Input into Your PowerShell Functions with Parameters Here's a quick walkthrough of how to build function parameters in reusable snippets. By Adam Bertram 04/07/2016 ...

For example, you wouldn't want to figure out how to make forms and place controls on your forms when you only want to display a message to your user for general information or to get some kind of ...

Posey's Tips & Tricks How To Validate Input in PowerShell Functions, Part 1 If your automated script takes action based on a value, it's critical to make sure the value is correct.