// include the latest version of the regex crate in your Cargo.toml
extern crate regex;
use regex::Regex;
fn main() {
let regex = Regex::new(r"(?ms)\(\s*define\s*(\(.*?\))").unwrap();
let string = "#lang sicp
(define (square x) (* x x))
(define (average x y) (/ (+ x y) 2))
; using block scope
(define (sqrt x)
; x is always the same -- \"4\" or whatever we pass to it, so we don't need that
; in every single function that we define, we can just inherit it from above.
(define (improve guess) (average guess (/ x guess)))
(define (good-enough? guess) (< (abs (- (square guess) x)) 0.001 ))
(define (sqrt-iter guess) (if (good-enough? guess) guess (sqrt-iter (improve guess))))
(sqrt-iter 1.0)
)
(sqrt 4)
(define (inc x) (+ x 1))
(define (dec x) (- x 1))
";
// result will be an iterator over tuples containing the start and end indices for each match in the string
let result = regex.captures_iter(string);
for mat in result {
println!("{:?}", mat);
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Rust, please visit: https://docs.rs/regex/latest/regex/