Macro regex

regex!() { /* proc-macro */ }

A simple regular expression macro.

This macro will validate the regular expression and will produce a compile time error if the expression is invalid. This can allow a developer to know that the hard coded regular expressions are valid. The result will be a valid [regex::Regex].

For example:

use rust_regex_dsl::regex;
use regex::Regex;
use std::sync::LazyLock;

static VALID_NAME: LazyLock<Regex> = LazyLock::new(|| regex!("[a-z][a-zA-Z_]*"));

Is equivalent to:

use rust_regex_dsl::regex;
use regex::Regex;
use std::sync::LazyLock;

static VALID_NAME: LazyLock<Regex> = LazyLock::new(|| Regex::new("[a-z][a-zA-Z_]*").unwrap());

But this:

use rust_regex_dsl::regex;
use regex::Regex;


static VALID_NAME: LazyLock<Regex> = LazyLock::new(|| regex!("[a-z][a-zA-Z_*"));

will fail with compilation error (because of the missing closing square bracket) while using the same without the macro will fail in run time.