trimws

0th

Percentile

Remove Leading/Trailing Whitespace

Remove leading and/or trailing whitespace from character strings.

Keywords
character
Usage
trimws(x, which = c("both", "left", "right"), whitespace = "[ \t\r\n]")
Arguments
x

a character vector

which

a character string specifying whether to remove both leading and trailing whitespace (default), or only leading ("left") or trailing ("right"). Can be abbreviated.

whitespace

a string specifying a regular expression to match (one character of) “white space”, see Details for alternatives to the default.

Details

Internally, sub(re, "", *, perl = TRUE), i.e., PCRE library regular expressions are used. For portability, the default ‘whitespace’ is the character class [ \t\r\n] (space, horizontal tab, carriage return, newline). Alternatively, [\h\v] is a good (PCRE) generalization to match all Unicode horizontal and vertical white space characters, see also https://www.pcre.org.

Aliases
  • trimws
Examples
library(base) # NOT RUN { x <- " Some text. " x trimws(x) trimws(x, "l") trimws(x, "r") ## Unicode --> need "stronger" 'whitespace' to match all : tt <- "text with unicode 'non breakable space'." xu <- paste(" \t\v", tt, "\u00a0 \n\r") (tu <- trimws(xu, whitespace = "[\\h\\v]")) stopifnot(identical(tu, tt)) # }
Documentation reproduced from package base, version 3.6.0, License: Part of R 3.6.0

Community examples

Looks like there are no examples yet.