Question

How to case-insensitively check if a character exists in a string with Rust

Answer 1

// Case-insensitive check without a loop
fn char_exists_ignore_case(s: &str, target: char) -> bool {
    // Convert both to lowercase and use contains()
    s.to_lowercase().contains(&target.to_lowercase().to_string())
}

fn main() {
    // Define the string we want to search in
    let s = "RustLanguage";

    // Perform the case-insensitive check
    let exists = char_exists_ignore_case(s, 'r');

    // Print the raw boolean result
    println!("{}", exists);

    // Conditional check
    if exists {
        println!("exists");
    } else {
        println!("not exists");
    }
}



/*
run:

true
exists

*/

 

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