To cite package ‘rex’ in publications use:

  Ushey K, Hester J, Krzyzanowski R (2024). _rex: Friendly Regular
  Expressions_. R package version 1.2.1.9000, ,
  <https://github.com/r-lib/rex>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {rex: Friendly Regular Expressions},
    author = {Kevin Ushey and Jim Hester and Robert Krzyzanowski},
    year = {2024},
    note = {R package version 1.2.1.9000, },
    url = {https://github.com/r-lib/rex},
  }