How to find the Indices of All Occurrences of Substring in Rust - Step by Step Examples

How to find the Indices of All Occurrences of Substring in Rust ?

Answer

To find the indices of all occurrences of a substring in Rust, you can use the find_indices method of the str type to find all occurrences and store their indices.


✐ Examples

1 Find Indices of All Occurrences in String

In this example,

  1. We create a string variable str with a string value.
  2. We use the find_indices method of the str type with the substring to find all occurrences and store their indices.
  3. We print the indices of all occurrences.

Rust Program

fn main() {
    let str = "Hello Hello Hello";
    let substr = "Hello";
    let indices: Vec<usize> = str.match_indices(substr).map(|(idx, _)| idx).collect();
    println!("Indices of all occurrences: {:?}", indices);
}

Output

Indices of all occurrences: [0, 6, 12]

2 Find Indices of All Occurrences in Another String

In this example,

  1. We create two string variables str and substr with different values.
  2. We use the find_indices method of the str type with the substring to find all occurrences and store their indices.
  3. We print the indices of all occurrences.

Rust Program

fn main() {
    let str = "apple banana cherry banana";
    let substr = "banana";
    let indices: Vec<usize> = str.match_indices(substr).map(|(idx, _)| idx).collect();
    println!("Indices of all occurrences: {:?}", indices);
}

Output

Indices of all occurrences: [6, 20]

Summary

In this tutorial, we learned How to find the Indices of All Occurrences of Substring in Rust language with well detailed examples.


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