Textbox and RegEx

[MarvelManiac]

We have servers and PCs in our environment
trying to force the users to make sure it's typed in correct in a textbox for validation
so example PC123 or SRV123
$textbox1_TextChanged={
if ($textbox1.Text.trim() -match '[Pp]{1}[Cc]{1}\d{3}$|[Ss]{1}[Rr]{1}[Vv]{1}\d{3}$')
{script}
}
else{$wshell = New-Object -ComObject Wscript.Shell
$wshell.Popup("Please type in correct Name", 0, "Notification")}

Not matter what I type, I get the popup

[jvierra]

How are you going to spell check? Why not use an autocompletion list restricted to only members of the list?

[MarvelManiac]

Not really spell check.. I just don't want them to be able to input anything but PC123 or SRV123. This is what I'm hoping my regex does, but that doesn't seem to be working as I expected.

The technicians will either type the PC name in 1 letter at a time or copy and paste the PC name

[jvierra]

Add those two items to the list.

For two items I would use a pair of checkboxes.

[MarvelManiac]

This is a gui to install an application out of a few thousand

so tech gets a call to install software, they can copy and paste from the ticket, or type in the characters individually

Copy and paste seems to be working fine.