如何在R包文档中使用或转义特殊字符@？

Ah, I've run into this exact issue before! The @ character is a special tag marker in Roxygen2, so even when it's inside a URL string in your examples, Roxygen tries to parse it as a documentation tag, leading to those annoying syntax errors.

Here are two solid ways to fix this:

1. Double Up the @ (@@) #

The easiest and most reliable fix is to replace the single @ with two @ signs (@@). Roxygen2 will automatically convert this pair into a single literal @ in the final documentation, and it works everywhere in your roxygen comments—not just examples.

Your corrected example code would look like this:

#' @importFrom utils file.edit
#' 
#' @export
#' 
#' @examples
#' library(dplyr)
#' medium("https://medium.com/@@data_datum/ggplot2-or-how-to-make-fancy-graphics-with-r-fabae7fc16d4")

2. Use a Single Backslash (\@) in Code Blocks #

If you prefer, in code sections like @examples, you can prepend the @ with a single backslash (\@). This tells Roxygen to treat the @ as a regular character instead of a tag.

Here's how that would look:

#' @importFrom utils file.edit
#' 
#' @export
#' 
#' @examples
#' library(dplyr)
#' medium("https://medium.com/\@data_datum/ggplot2-or-how-to-make-fancy-graphics-with-r-fabae7fc16d4")

Why Your Multiple Backslash Attempts Didn't Work #

You tried single, double, triple, and quadruple backslashes, but that's overcomplicating things. Roxygen doesn't require escaping the backslash itself in comment blocks—using just one \@ is enough. Extra backslashes would end up as literal backslashes in your URL, which isn't what you want.

Content of the question originates from Stack Exchange, asked by stevec