Rust Tutorials

How to find the Index of Last Occurrence of Substring in Rust

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How to find the Index of Last Occurrence of Substring in Rust ?

Answer

To find the index of the last occurrence of a substring in Rust, you can use the rfind method of the String type.

✐ Examples

1 Find Index of Last Occurrence in String

In this example,

We create a string variable str with a string value.
We use the rfind method of the string type to find the index of the last occurrence of a specific character within str.
The rfind method returns the index of the last occurrence of the character in the string.
Finally, we print the index.

Rust Program

fn main() {
    let str = String::from("Hello World, Hello Rust");
    let last_index = str.rfind('H').unwrap();
    println!("Last index of substring is: {}", last_index);
}

Output

Last index of substring is: 14

2 Find Index of Last Occurrence in Another String

In this example,

We create two string variables str1 and str2 with different values.
We use the rfind method of str1 to find the index of the last occurrence of str2 within str1.
The rfind method returns the index of the last occurrence of str2 in str1.
Finally, we print the index.

Rust Program

fn main() {
    let str1 = String::from("apple banana cherry banana");
    let str2 = "banana";
    let last_index = str1.rfind(str2).unwrap();
    println!("Last index of substring is: {}", last_index);
}

Output

Last index of substring is: 17

Summary

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

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How to find the Index of Last Occurrence of Substring in Rust

How to find the Index of Last Occurrence of Substring in Rust ?

Answer

✐ Examples

1 Find Index of Last Occurrence in String

Rust Program

Output

2 Find Index of Last Occurrence in Another String

Rust Program

Output

Summary

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