Using the pipe in GREP

Hi,

I'm trying to fashion a GREP search that finds an word in all caps, followed by a a space and then a word in U&lc or a digit. Then replace the space with a hard return.

Changing this:

TEXT DESIGN Marijka Kostiw

Into this:

TEXT DESIGN

Marijka Kostiw

However, sometimes I need to change something like this:

TEXT STOCK 150GSM MUNKEN PRINT CREAM

Into this:

TEXT STOCK

150GSM MUNKEN PRINT CREAM

This search/replace works if the initial uppercase word is followed by an U&lc word, but not if it is followed by a digit:

Find: (\u+) (\u\l)

Replace: $1\r$2

I'm having a tough time figuring out how to use the pipe to say "uppercase character followed by lowercase character or digit."

Can anyone offer any advice?

Thanks,

Chris