The “str_match_all” Function in R

• Package: stringr

• Purpose: To extract all matched groups from a character vector using regular expressions.

• General Class: String Manipulation

• Required Argument(s):

• string: A character vector where matches will be sought.

• pattern: A regular expression pattern.

• Notable Optional Arguments:

• None

• Example:

• # Example usage
  library(stringr)
  
  # Create a character vector
  text <- c("apple 123", "banana 456", "orange 789")
  
  # Use str_match_all to extract all numeric digits from each element
  matches_all <- str_match_all(text, "\\d+")
  
  # Print the list of matches
  print(matches_all)

• In this example, the str_match_all function from the stringr package is used to extract all numeric digits from each element of the character vector text using a regular expression pattern (\\d+). The resulting list of matches is then printed to the console. Each element of the list corresponds to a character vector of matches for the respective input string.