#' 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.
#' @details 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...).
#' @source 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.
#' @seealso \code{\link[base]{grep}}
#' @examples
#' # simple test
#' a <- "This is a test"
#' b <- "TEST"
#' a %like% b
#' #> TRUE
#' b %like% a
#' #> FALSE
#'
#' # also supports multiple patterns, length must be equal to x
#' a <- c("Test case", "Something different", "Yet another thing")
#' b <- c("case", "diff", "yet")
#' a %like% b
#' #> TRUE TRUE TRUE
#'
#' # get frequencies of bacteria whose name start with 'Ent' or 'ent'
#' library(dplyr)
#' septic_patients %>%
#' left_join_microorganisms() %>%
#' filter(genus %like% '^ent') %>%
#' freq(genus, species)
like<-function(x,pattern){
if(length(pattern)>1){
if(length(x)!=length(pattern)){
pattern<-pattern[1]
warning('only the first element of argument `pattern` used for `%like%`',call.=FALSE)
}else{
# x and pattern are of same length, so items with each other
