Rust Tutorials

How to Replace All Occurrences of a Substring in a String in Rust

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How to Replace All Occurrences of a Substring in a String in Rust ?

Answer

To replace all occurrences of a substring in a string in Rust, you can use the replace method.

✐ Examples

1 Replacing Substring "Hello" with "Hi"

In this example,

We create a string named str.
We call the replace method on str with the substring to be replaced and the replacement string as arguments.
The replace method returns a new string with all occurrences of the substring replaced.
Finally, we print the modified string.

Rust Program

fn main() {
    let mut str = String::from("Hello World Hello");
    str = str.replace("Hello", "Hi");
    println!("{}", str);
}

Output

Hi World Hi

2 Replacing Character 'o' with 'X'

In this example,

We create a string named str.
We use the chars_mut method to obtain a mutable iterator over the characters of the string, then iterate over each character and replace 'o' with 'X'.
Finally, we print the modified string.

Rust Program

fn main() {
    let mut str = String::from("Hello World Hello");
    for c in str.chars_mut() {
        if c == 'o' {
            *c = 'X';
        }
    }
    println!("{}", str);
}

Output

HellX WXrld HellX

Summary

In this tutorial, we learned How to Replace All Occurrences of a Substring in a String in Rust language with well detailed examples.

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How to Replace All Occurrences of a Substring in a String in Rust

How to Replace All Occurrences of a Substring in a String in Rust ?

Answer

✐ Examples

1 Replacing Substring "Hello" with "Hi"

Rust Program

Output

2 Replacing Character 'o' with 'X'

Rust Program

Output

Summary

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