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% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/trim.R
\name{stri_trim_both}
\alias{stri_trim_both}
\alias{stri_trim}
\alias{stri_trim_left}
\alias{stri_trim_right}
\title{Trim Characters from the Left and/or Right Side of a String}
\usage{
stri_trim_both(str, pattern = "\\\\P{Wspace}", negate = FALSE)
stri_trim_left(str, pattern = "\\\\P{Wspace}", negate = FALSE)
stri_trim_right(str, pattern = "\\\\P{Wspace}", negate = FALSE)
stri_trim(
str,
side = c("both", "left", "right"),
pattern = "\\\\P{Wspace}",
negate = FALSE
)
}
\arguments{
\item{str}{a character vector of strings to be trimmed}
\item{pattern}{a single pattern, specifying the class of characters
(see \link{stringi-search-charclass}) to
to be preserved (if \code{negate} is \code{FALSE}; default)
or trimmed (otherwise)}
\item{negate}{either \code{TRUE} or \code{FALSE}; see \code{pattern}}
\item{side}{character [\code{stri_trim} only]; defaults to \code{'both'}}
}
\value{
All functions return a character vector.
}
\description{
These functions may be used, e.g., to remove unnecessary
white-spaces from strings. Trimming ends at the first or
starts at the last \code{pattern} match.
}
\details{
Vectorized over \code{str} and \code{pattern}.
\code{stri_trim} is a convenience wrapper over \code{stri_trim_left}
and \code{stri_trim_right}.
Contrary to many other string processing libraries,
our trimming functions are universal. The class of characters
to be retained or trimmed can be adjusted.
For replacing pattern matches with
an arbitrary replacement string, see \code{\link{stri_replace}}.
Trimming can also be used where you would normally rely on
regular expressions. For instance, you may get
\code{'23.5'} out of \code{'total of 23.5 bitcoins'}.
For trimming white-spaces, please note the difference
between Unicode binary property `\code{\\p\{Wspace\}}` (more universal)
and general character category `\code{\\p\{Z\}}`,
see \link{stringi-search-charclass}.
}
\examples{
stri_trim_left(' aaa')
stri_trim_right('r-project.org/', '\\\\P{P}')
stri_trim_both(' Total of 23.5 bitcoins. ', '\\\\p{N}')
stri_trim_both(' Total of 23.5 bitcoins. ', '\\\\P{N}', negate=TRUE)
}
\seealso{
The official online manual of \pkg{stringi} at \url{https://stringi.gagolewski.com/}
Gagolewski M., \pkg{stringi}: Fast and portable character string processing in R, \emph{Journal of Statistical Software} 103(2), 2022, 1-59, \doi{10.18637/jss.v103.i02}
Other search_replace:
\code{\link{about_search}},
\code{\link{stri_replace_all}()},
\code{\link{stri_replace_rstr}()}
Other search_charclass:
\code{\link{about_search_charclass}},
\code{\link{about_search}}
}
\concept{search_charclass}
\concept{search_replace}
\author{
\href{https://www.gagolewski.com/}{Marek Gagolewski} and other contributors
}
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