How to find the Index of Substring in R - Step by Step Examples

How to find the Index of Substring in R ?

To find the index of a substring in R, you can use the `gregexpr` function.

In this example,

We create a string named `str` with a string value.
We use the `gregexpr` function with the pattern of the substring within `str` to find the index of the substring.
The `gregexpr` function returns a list of starting indices of the substring in the string.
Finally, we print the index to standard output.

str <- "Hello World"
pattern <- "World"
result <- gregexpr(pattern, str, fixed = TRUE)
indices <- result[[1]]
print(indices[1])

[1] 7

In this example,

We create a string named str with a string value.
We use the gregexpr function with the pattern "banana" on str to find the index of the substring.
The gregexpr function returns a list of integer vectors indicating the start and end positions of the matches.
Finally, we extract the index from the list and print it to standard output.

str <- "apple banana apple cherry"
matches <- gregexpr("banana", str)
index <- matches[[1]][1]
print(paste("Index of substring is:", index))

Index of substring is: 7

In this tutorial, we learned How to find the Index of Substring in R language with well detailed examples.