Hands-On Microservices with Rust

Adding the necessary dependencies

To use regular expressions in our server, we need two crates: regex and lazy_static. The first provides a Regex type to create and match regular expressions with strings. The second helps to store Regex instances in a static context. We can assign constant values to static variables, because they're created when a program loads to memory. To use complex expressions, we have to add an initialization code and use it to execute expressions, assigning the result to a static variable. The lazy_static crate contains a lazy_static! macro to do this job for us automatically. This macro creates a static variable, executes an expression, and assigns the evaluated value to that variable. We can also create a regular ...