Reference:
  Author: Marek Gagolewski and Bartlomiej Tartanus and Oliver Keyes and Marcin Pawel Bujarski 
  Title: "R package stringi: Character string processing facilities"
  Journal: zenodo
  Year: 2015
  DOI: 10.5281/zenodo.19071
  URL: https://zenodo.org/record/19071
