Removing color decorations from strings before writing them to logfile

This is my current solution

class ColourBlind
  def initialize(*targets)
     @targets = targets
  end

  def write(*args)
    @targets.each {|t| t.write(*args.map {|x| x.gsub(/\e\[(\d+)m/, '')}.compact)}
  end

  def close
    @targets.each(&:close)
  end
end

And then:

$logger = Logger.new MultiIO.new($stdout, ColourBlind.new(log_file))

For removal of ANSI colors, I would recommend

string_with_ascii = "..."
string_no_ascii = string_with_ascii.gsub(/\e\[([;\d]+)?m/, '')