Extract R code and comments from a given input string.
This function takes an input string, detects R code and comments, and returns a character vector containing the R code and comments. The input string is split into lines based on newline characters, and each line is examined for R code and comment patterns. Only the lines that match either of these patterns are returned.
A character string containing R code and comments, mixed with other text. The string may contain multiple lines separated by newline characters.
A character vector containing R code and comment lines extracted from the input string. Each element in the vector corresponds to one line of code or a comment.