Operations Manager – Dynamic Group Using Regular Expression

I have a bunch of machines that are all named using the same syntax that I would like to create a dynamic group for.  The computer names all look like AA-DEV-AA where the ending AA is always the individual developers initials.  In my case my computer name would be AA-DEV-JB.  I created the dynamic group using the regular expression below.

The ?i: ensures that the expression is not case sensitive.  The $ at the end is because there are some machines that are named things like AA-DEV-SQL which I don’t want to include in the group.