regex_if

lazy_regex

Macro regex_if 

Source 
regex_if!() { /* proc-macro */ }
Expand description

Return an Option<T>, with T being the type returned by the block or expression given as third argument.

If the regex matches, executes the expression and return it as Some. Return None if the regex doesn’t match.

 let grey = regex_if!(r#"^gr(a|e)y\((?<level>\d{1,2})\)$"#, "grey(22)", {
     level.parse().unwrap()
 });
 assert_eq!(grey, Some(22));