use-ing Dependencies

Now that we've added the regex crate as a dependency, we are ready to use it (pun intended). You can refer to the crate by the full path name regex::Regex (crate::module) or, more commonly, by bringing the module into scope with the use¹ keyword.

We've been doing this in our grep program:

use std::fs::File;
use std::io::Read;
use std::io::{BufRead, BufReader};
use std::process::exit;

By bringing the module into scope with use regex::Regex;, we can reference it with Regex.

Now that we know how to add dependencies to our project and use them, it's time to add support for regular expressions!