matching multiple times in same line

Hi,
I am stuck with pattern matching.

I need to match a particular pattern several times in a same line and replace them.

for ex.,
I need to convert

(abc XY) (bvf ZY) bla bla

to

XY ZY bla bla

I tried..

s/\([a-z]+ (.[A-Z]+)\)/$1/gi

and it works

(abc XY) ZY bla bla

Can someone help me?

Thanks

sed 's/([a-z]\{3\} \([A-Z]\{2\}\))/\1/g'

Thanks Perderabo,

I did this in Perl using

s/\([abc]+ (\w+)\)/$1/g

Thanks again!