How to Use Regular Expressions in Rust

Rust does not have built-in regular expression support; you must use the external regex crate. Add the dependency to your Cargo.toml and use Regex::new to compile a pattern, then call .is_match() or .find() on your text.

use regex::Regex;

fn main() {
    let re = Regex::new(r"^a.*b$").unwrap();
    println!("Match found: {}", re.is_match("abc"));
}

1. Add regex = "1" to the [dependencies] section in your Cargo.toml file.
2. Import the Regex struct into your scope with use regex::Regex;.
3. Compile your pattern string into a Regex object using Regex::new("your_pattern").unwrap();.
4. Check if a string matches the pattern by calling re.is_match("your_text").

Regular expressions are powerful patterns used to search for specific text structures within strings. Since Rust's standard library doesn't include this feature, you need to install a separate tool called the regex crate to use them. Think of it like adding a specialized search engine to your code that can find complex patterns like email addresses or phone numbers.