How do I add new line in parameter?

I am trying to use Rexrainbow Matcher addon, 2d pattern template. I don't know how to add a new line in the parameter input field. I want this

",x

x,x"

I was able to insert this into the field by copying it from notepad and pasting into the field.

Is this the only way to do it? I can't use ENTER in the field as it just closes the input dialog and the field does not seem to accept \n.

Thanks

Thanks for providing the answer - I would probably not have thought of that!