# Helper functions for naming tests
#' Check if a String is a Valid fmrireg Column Heading
#'
#' Based on the agreed grammar, allowing letters, numbers, dot, underscore, and hash.
#' Starts with a letter or dot.
#'
#' @param x Character vector of potential headings.
#' @return Logical vector.
is_valid_heading <- function(x) {
# Allows letters, numbers, ., _, and # (for unique tags)
# Must start with a letter or dot.
grepl("^[A-Za-z\\.][A-Za-z0-9\\._#]*$", x)
}
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