CRAN Recipes: DPLYR, Stringr, Lubridate, and RegEx in R

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2021

W. YarberryCRAN Recipeshttps://doi.org/10.1007/978-1-4842-6876-6_6

6. Some Simple Patterns

William Yarberry¹  

(1)

Kingwood, TX, USA

 

Regular expressions , taken to their extreme, can make you feel irregular. For many R programming tasks, only a few meta-characters need be used. Table 6-1 is from an excellent Loyola Marymount University website.¹ In R, the regular expression will be enclosed in quotes and used in one of the seven functions listed in Chapter 9, “The Magnificent Seven.”

Table 6-1

Example regular expressions

Example regular expression	Matches any string that
Hello	Contains {hello}.
gray|grey	Contains {gray, grey}.
gr(a|e)y	Contains {gray, grey}.
gr[ae]y