def extract_emails_to_array(txt)
  reg = /[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}/i
  txt.scan(reg).uniq
end


entrada = "GruposYahoo"
salida = "SalidaYahoo.txt"
path_filename = "/home/HUENEI/fandino"


filename = path_filename + "/"  + entrada
outputfilename = path_filename + "/"  + salida

input = IO.readlines(filename)
output = File.new(outputfilename,  "w+")


result_array = extract_emails_to_array(input.join(" ")).sort
#puts result_array.size

result_array.each{|s| output << s.to_s+"\n" }