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$expect_verbose = false

class IO
  def expect(pat,timeout=9999999)
    buf = ''
    case pat
    when String
      e_pat = Regexp.new(Regexp.quote(pat))
    when Regexp
      e_pat = pat
    end
    while true
      if !IO.select([self],nil,nil,timeout) or eof? then
        result = nil
        break
      end
      c = getc.chr
      buf << c
      if $expect_verbose
        STDOUT.print c
        STDOUT.flush
      end
      if mat=e_pat.match(buf) then
        result = [buf,*mat.to_a[1..-1]]
        break
      end
    end
    if block_given? then
      yield result
    else
      return result
    end
    nil
  end
end