Regular expression

Hello,

I need to split a string (a Distinguished Name) in 2 parts: CN and OUs

Here is an example of the string:

$DNString = "CN=MyGroup,OU=OU3,OU=OU2,OU=OU1,DC=mydomain,DC=local"

With this command, I can get CN part:

$CN = $DNString.Split(",") | select -first 1

But I fail to get OU part: OU=OU3,OU=OU2,OU=OU1