I have a text(ex: "a b cd" or "aa1 b c def") containing feq

I have a text(ex: "a b cd" or "aa1 b c def") containing feq chars/word and spaces. I want to get the substring after last space(in this case: cd or def), without using split function. Since it is going to be part of a doForEach i will not be able to use split function.
Thanks in advance....

OriginalPostID-62321

OriginalPostID-62321