Use a lookahead:
print split '\.(?=[^.]*$)', $_ for 'x.y', 'x.y.z';;
x y
x.y z
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.