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#' @title Common regular expression patterns used by lettercase
#'
#' @description These are patterns that are used in the lettercase package.
#'
#' @details
#' \code{lettercase} provides a number of regular expression patterns that are
#' used by the case conversion functions.
#'
#' These are not exported; to use them prefix them with \code{lettercase:::*}
#'
#' @rdname patterns
pattern_whitespace <- '\\s'
#' @rdname patterns
pattern_whitespace_like <- "[-_]"
#' @rdname patterns
pattern_separators <- '[\\s_\\.-]'
#' @rdname patterns
pattern_ucfirst <- '\\b([a-z])'
#' @rdname patterns
pattern_word <- '\\w'
#' @rdname patterns
pattern_nonword <- '\\W'
#' @rdname patterns
pattern_uppercase <- '[A-Z]'
#' @rdname patterns
pattern_lowercase <- '[a-z]'
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