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67 lines
2.5 KiB
R
Executable File
67 lines
2.5 KiB
R
Executable File
% 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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\title{Pattern Matching}
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\source{
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Idea from the \href{https://github.com/Rdatatable/data.table/blob/master/R/like.R}{\code{like} function from the \code{data.table} package}, but made it case insensitive at default and let it support multiple patterns.
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}
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\usage{
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like(x, pattern)
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x \%like\% pattern
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}
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\arguments{
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\item{x}{a character vector where matches are sought, or an
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object which can be coerced by \code{as.character} to a character
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vector. \link{Long vectors} are supported.}
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\item{pattern}{character string containing a \link{regular expression}
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(or character string for \code{fixed = TRUE}) to be matched
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in the given character vector. Coerced by
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\code{\link{as.character}} to a character string if possible. If a
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character vector of length 2 or more is supplied, the first element
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is used with a warning. Missing values are allowed except for
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\code{regexpr} and \code{gregexpr}.}
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}
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\value{
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A \code{logical} vector
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}
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\description{
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Convenient wrapper around \code{\link[base]{grep}} to match a pattern: \code{a \%like\% b}. It always returns a \code{logical} vector and is always case-insensitive. Also, \code{pattern} (\code{b}) can be as long as \code{x} (\code{a}) to compare items of each index in both vectors.
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}
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\details{
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Using RStudio? This function can also be inserted from the Addins menu and can have its own Keyboard Shortcut like Ctrl+Shift+L or Cmd+Shift+L (see Tools > Modify Keyboard Shortcuts...).
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}
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\section{Read more on our website!}{
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On our website \url{https://msberends.gitlab.io/AMR} you can find \href{https://msberends.gitlab.io/AMR/articles/AMR.html}{a comprehensive tutorial} about how to conduct AMR analysis, the \href{https://msberends.gitlab.io/AMR/reference}{complete documentation of all functions} (which reads a lot easier than here in R) and \href{https://msberends.gitlab.io/AMR/articles/WHONET.html}{an example analysis using WHONET data}.
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}
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\examples{
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# simple test
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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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#> TRUE
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b \%like\% a
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#> FALSE
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# also supports multiple patterns, length must be equal to x
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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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#> TRUE TRUE TRUE
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# get frequencies of bacteria whose name start with 'Ent' or 'ent'
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library(dplyr)
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septic_patients \%>\%
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left_join_microorganisms() \%>\%
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filter(genus \%like\% '^ent') \%>\%
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freq(genus, species)
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}
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\seealso{
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\code{\link[base]{grep}}
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}
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