1. Open the Cargo.toml file in your favorite text editor; in this recipe, we will use the nano editor:

      nano Cargo.toml

You should get the following output:

2. Add a [dependencies] section to the cargo.toml file and enter time = "0.1.12" and regex = "0.1.41" below it.

You should get the following output:

3. Use the cat command to see the configuration list:

      cat Cargo.toml

You should get the following output:

4. Build the project to pull the dependencies from https://crates.io/:

      cargo build

You should get the following output:

5. Use the existing crates pulled in our project.

Open the main.rs file in the src directory using nano and enter the following code:

      nano main.rs

You should get the following output:

        // Declare the external crate
        extern crate regex;
        use regex::Regex;
        fn main() {
          let check_date = Regex::new(r"^d{4}-d{2}-d{2}$").unwrap();
          println!("Did our date match? {}", check_date.is_match("2017
          -02-01"));
        }

You should get the following state output:

6. Compile and run the project:

      cargo run 

You should get the following output: