Remove all special characters from string

What is easiest way to remove all special characters from string using Powershell?

Of course regex, but here you can see how it works:
[System.Text.RegularExpressions.Regex]::Replace($Text,"[^1-9a-zA-Z_]"," ");

 

For example

PS C:\Users\Martin> [System.Text.RegularExpressions.Regex]::Replace("I got cool
n1ck%/\/\name($7&","[^1-9a-zA-Z_]"," ");
I got cool n1ck     name

 

I am replacing special characters with space, however of course you can use whatever you want – typically “_”