To cite package ‘regexSelect’ in publications use:

  Sidi J (2017). _regexSelect: Regular Expressions in 'shiny' Select
  Lists_. R package version 1.0.0,
  <https://github.com/yonicd/regexselect>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {regexSelect: Regular Expressions in 'shiny' Select Lists},
    author = {Jonathan Sidi},
    year = {2017},
    note = {R package version 1.0.0},
    url = {https://github.com/yonicd/regexselect},
  }