fails on this code

[rdp]

  def focus_word(focus_segment)
    focus_world = ''
    char = focus_segment[-1..-1]
  while [")","]","}"].include?(char)
    char=focus_segment[-2..-2]
    focus_segment = focus_segment[0..-2]
  end
  j = focus_segment.length - 1
  while !["\s","\t",";",",","(","[","{",">"].include?(char) && j >= 0
    focus_world = "#{char}#{focus_world}"
    j=j-1
    char = focus_segment[j..j]
  end
  focus_world
end

[rdp]

presumably because of the extra ('s in there?