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#' Sub string reverse
#'
#' Returns portion of string starting from end of string (otherwise just like substr)
#'
#' @param x Character vector
#' @param start Number of characters to include relative to the last
#' character position.
#' @param stop Specify the number of characters from the final
#' character to set as the last character position.
#' @return Sub string with last i characters.
#' @export
substrev <- function(x, start, stop = 0) {
substr(x, nchar(x) - start, nchar(x) - stop)
}
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