E.3 Summary

For a compact and useful overview of R’s regex options, see the RStudio cheatsheet on Basic Regular Expressions in R (contributed by Ian Kopacka):

Basic regular expressions in R (by Ian Kopacka)<br> available at [RStudio cheatsheets](https://www.rstudio.com/resources/cheatsheets/).

Figure E.2: Basic regular expressions in R (by Ian Kopacka)
available at RStudio cheatsheets.

Additionally, the back page of the RStudio cheatsheet on the stringr package (Wickham, 2019b) contains a useful overview on regular expressions:

Text and string manipulation with **stringr** and regular expressions<br>from [RStudio cheatsheets](https://www.rstudio.com/resources/cheatsheets/).

Figure E.3: Text and string manipulation with stringr and regular expressions
from RStudio cheatsheets.

For more information on creating and manipulating strings of text, see Chapter 9 on Strings of text.