Visit the package website.
The package will be available at CRAN when it is done. Install the developer version using devtools package and type the following command in R:
devtools::install_github("jakobbossek/re")
Please address questions and missing features about the re to the author Jakob Bossek j.bossek@gmail.com. Found some nasty bugs? Please use the issue tracker for this. Pay attention to explain the problem as good as possible. At its best you provide an example, so I can reproduce your problem quickly.