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_10

10. Regular Expressions in Stringr

William Yarberry¹  

(1)

Kingwood, TX, USA

 

You can use the following prebuilt classes in the package Stringr¹:

• [:punct:] – Punctuation

• [:alpha:] – Letters

• [:lower:] – Lowercase letters

• [:upper:] – Uppercase letters

• [:digit:] – Digits

• [:xdigit:] – Hexadecimal digits

• [:alnum:] – Letters and numbers

• [:cntrl:] – Control characters

• [:graph:] – Letters, numbers, and punctuation

• [:print:] – Letters, numbers, punctuation, and whitespace

• [:space:] – Space characters (basically equivalent to \s)

• [:blank:] – Space and tab

Examples:

str_extract_all("The Howdy Doody Show 123", "[:alpha:]") ...