Masking Emails with Powershell

Hello Folks,

Does anybody knows how to utilize Regex  in Powershell? 

My goal just leave the first 2 characters of the email viewable but then mask the rest with " * "

something like:

johndoe@emaildomain.com

to

jo******@emaildomain.com 

There's a perfect example here  

?<=.{1}).(?=[^@]*?@)

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 while utilizing Regex. but I dont know how to translate i to powershell 

any thoughts?

Ivan