Titlebook: CRAN Recipes; DPLYR, Stringr, Lubr William Yarberry Book 2021 William Yarberry 2021 R.programming.CRAN.DPLYR.Stringr.Lubridate.RegEx.regula

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Carbon-Monoxide

jungle

Some Simple Patterns, 6-1 is from an excellent Loyola Marymount University website. In R, the regular expression will be enclosed in quotes and used in one of the seven functions listed in Chapter ., “The Magnificent Seven.”

偶然

Elements of Regular Expressions,ase of the plus sign, its special meaning is “additional characters like one just to the left of the + sign.” If you want to use any of these reserved characters as a literal in a regex, you need to escape them with a backslash. If you want to match 1+1=2, the correct regex is 1\+1=2. Otherwise, the

antenna

Unicode,s less commonly used. Other representations of characters depend on the standard selected, which in turn may depend on the locale. As an example, consider the trademark sign. In MS Word and other MS Office applications, Ctrl-Alt-T or Alt8482 will create the trademark sign: ™. In Unicode, it is u2122

addict

addict

RegEx Summary,actions. However, the scope of regex pattern matching exceeds traditional R logic. Even knowing just a few regex examples will speed your code development and possibly reduce execution time of your script.

争议的苹果

neutral-posture

Optometrist

Validation of Data,lysis. Several cleanup packages have been developed, including janitor and validate. Figure 19-1, from the validate package, shows a convenient graphic of three mtcars variables. It meets the data science trifecta: simple, quick, and handy.