code: func NewBlanklineTokenizer() *RegexpTokenizer {
  	return &RegexpTokenizer{
  		regex: regexp.MustCompile(`\s*\n\s*\n\s*`), gaps: true, discard: true}
  }
docs: // NewBlanklineTokenizer is a RegexpTokenizer constructor.
  //
  // This tokenizer splits on any sequence of blank lines.