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79 lines
3.2 KiB
R
79 lines
3.2 KiB
R
% Generated by roxygen2: do not edit by hand
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% Please edit documentation in R/like.R
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\name{like}
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\alias{like}
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\alias{\%like\%}
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\alias{\%unlike\%}
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\alias{\%like_case\%}
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\alias{\%unlike_case\%}
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\title{Vectorised Pattern Matching with Keyboard Shortcut}
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\source{
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Idea from the \href{https://github.com/Rdatatable/data.table/blob/ec1259af1bf13fc0c96a1d3f9e84d55d8106a9a4/R/like.R}{\code{like} function from the \code{data.table} package}, although altered as explained in \emph{Details}.
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}
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\usage{
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like(x, pattern, ignore.case = TRUE)
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x \%like\% pattern
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x \%unlike\% pattern
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x \%like_case\% pattern
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x \%unlike_case\% pattern
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}
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\arguments{
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\item{x}{a \link{character} vector where matches are sought, or an object which can be coerced by \code{\link[=as.character]{as.character()}} to a \link{character} vector.}
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\item{pattern}{a \link{character} vector containing regular expressions (or a \link{character} string for \code{fixed = TRUE}) to be matched in the given \link{character} vector. Coerced by \code{\link[=as.character]{as.character()}} to a \link{character} string if possible.}
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\item{ignore.case}{if \code{FALSE}, the pattern matching is \emph{case sensitive} and if \code{TRUE}, case is ignored during matching.}
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}
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\value{
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A \link{logical} vector
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}
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\description{
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Convenient wrapper around \code{\link[=grepl]{grepl()}} to match a pattern: \code{x \%like\% pattern}. It always returns a \code{\link{logical}} vector and is always case-insensitive (use \code{x \%like_case\% pattern} for case-sensitive matching). Also, \code{pattern} can be as long as \code{x} to compare items of each index in both vectors, or they both can have the same length to iterate over all cases.
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}
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\details{
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These \code{\link[=like]{like()}} and \verb{\%like\%}/\verb{\%unlike\%} functions:
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\itemize{
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\item Are case-insensitive (use \verb{\%like_case\%}/\verb{\%unlike_case\%} for case-sensitive matching)
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\item Support multiple patterns
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\item Check if \code{pattern} is a valid regular expression and sets \code{fixed = TRUE} if not, to greatly improve speed (vectorised over \code{pattern})
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\item Always use compatibility with Perl unless \code{fixed = TRUE}, to greatly improve speed
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}
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Using RStudio? The \verb{\%like\%}/\verb{\%unlike\%} functions can also be directly inserted in your code from the Addins menu and can have its own keyboard shortcut like \code{Shift+Ctrl+L} or \code{Shift+Cmd+L} (see menu \code{Tools} > \verb{Modify Keyboard Shortcuts...}). If you keep pressing your shortcut, the inserted text will be iterated over \verb{\%like\%} -> \verb{\%unlike\%} -> \verb{\%like_case\%} -> \verb{\%unlike_case\%}.
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}
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\examples{
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# data.table has a more limited version of \%like\%, so unload it:
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try(detach("package:data.table", unload = TRUE), silent = TRUE)
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a <- "This is a test"
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b <- "TEST"
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a \%like\% b
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b \%like\% a
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# also supports multiple patterns
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a <- c("Test case", "Something different", "Yet another thing")
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b <- c("case", "diff", "yet")
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a \%like\% b
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a \%unlike\% b
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a[1] \%like\% b
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a \%like\% b[1]
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\donttest{
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# get isolates whose name start with 'Entero' (case-insensitive)
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example_isolates[which(mo_name() \%like\% "^entero"), ]
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if (require("dplyr")) {
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example_isolates \%>\%
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filter(mo_name() \%like\% "^ent")
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}
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}
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}
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\seealso{
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\code{\link[=grepl]{grepl()}}
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}
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