#' @param aa.regex A Perl regular expression with name capture,
#' intended to be run on column names and capturing via named
#' capture the following regex groups: `"attr"`, `"src"`, and
#' `"tgt"`, representing the edge attribute being captured, the
#' source (or the first alter identified), and the target (or the
#' second alter identified) of the edge, respectively. See [`regex`]
#' for more information.
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