I have ldap output

CN=TinyTim3,OU=Pending Assigment,OU=SplitPositions,OU=Staff,DC=instructional,DC=savannah,DC=chatham,DC=k12,DC=ga,DC=us

Sharepoint and Nintex workflow 2013

How do i get the text   TinyTim3     extracted from this string?

Do i use regular expression? If so what would extract the data?

I tried Query XML to no success.

Thanks for your help.