gistfile1.rb

def extract_extensions(filename)
  extensions, *name = filename.split(".").reverse.slice_before { |f| f[" "] }.to_a
  [name.flatten.reverse.join("."), extensions.reverse]
end

describe "#extract_extensions" do
  specify { extract_extensions("some file name.with dots.html.markdown").should == ["some file name.with dots", ["html", "markdown"]]}
  specify { extract_extensions("some file name with.dots.html.markdown").should == ["some file name with", ["dots", "html", "markdown"]]}
  specify { extract_extensions("a b.c d.e").should == ["a b.c d", ["e"]] }
  specify { extract_extensions("a.b c.a").should == ["a.b c", ["a"]] }
end