The “str_sub” Function in R

• Package: stringr

• Purpose: To extract a substring from each element of a character vector based on position.

• General Class: String Manipulation

• Required Argument(s):

• string: A character vector from which to extract substrings.

• start: Starting position of the substring.

• end: Ending position of the substring.

• Notable Optional Arguments:

• ...: Additional arguments influencing the extraction process, such as ignore_case to perform case-insensitive matching.

• Example:

• # Example usage
  library(stringr)
  
  sentence <- "The quick brown fox jumps over the lazy dog."
  
  # Extract a substring from position 5 to 15 in the sentence
  substring_example <- str_sub(sentence, start = 5, end = 15)
  
  print(substring_example)

In this example, the str_sub function from the stringr package is used to extract a substring from position 5 to 15 in the character vector sentence. The result is a character vector with the extracted substrings.