Macro regex_switch 

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

Define a set of lazy static statically compiled regexes, with a block or expression for each one. The first matching expression is computed with the named capture groups declaring &str variables available for this computation. If no regex matches, return None.

Example:

#[derive(Debug, PartialEq)]
enum Color {
    Grey(u8),
    Pink,
    Rgb(u8, u8, u8),
}

let input = "rgb(1, 2, 3)";
let color = regex_switch!(input,
    r#"^gr(a|e)y\((?<level>\d{1,2})\)$"#i => {
        Color::Grey(level.parse()?)
    }
    "^pink"i => Color::Pink,
    r#"^rgb\((?<r>\d+),\s*(?<g>\d+),\s*(?<b>\d+),?\)$"#i => Color::Rgb (
        r.parse()?,
        g.parse()?,
        b.parse()?,
    ),
);
assert_eq!(color, Some(Color::Rgb(1, 2, 3)));