Extract optional argument

Extract optional argument

extract_optional_LaTeX_argument(tex_lines, command_name, n = 1L,
  by.line = FALSE)

Arguments

tex_lines	A character vector reading from a LaTeX document.
command_name	Name of command (without backslash)
n	Which optional argument to extract.
by.line	Should the output be one row per command (FALSE, the default), with extracts concatenated via paste0(..., collapse = "") or one row per line per command?