To find the index of the last occurrence of a substring in R, you can use the `gregexpr` function along with the `tail` and `unlist` functions to extract the last occurrence's index from the result.
In this example,
str <- "hello hello world"
substring <- "hello"
positions <- gregexpr(substring, str)[[1]]
last_index <- tail(positions, 1)
print(last_index)
[1] 7
In this example,
str1 <- "apple banana cherry banana"
str2 <- "banana"
positions <- gregexpr(str2, str1)[[1]]
last_index <- tail(positions, 1)
print(last_index)
[1] 21
In this tutorial, we learned How to find the Index of Last Occurrence of Substring in R language with well detailed examples.