// 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"(?x)(?P<q_num>\d{1,3})\)\s?(?P<quest>.+)\n
(\s?a\)\s?)(?P<ans_a>(?:(?![a-d]\)).)+)
(b\)\s?)(?P<ans_b>(?:(?![a-d]\)).)+)
((c\)\s?)(?P<ans_c>(?:(?![a-d]\)).)+))?
((d\)\s?)(?P<ans_d>(?:(?![a-d]\)).)+))?").unwrap();
let string = "1) First question with 4 choices ?
a) First choice b) Second choice c) Third choice d) Last choice
2) Second question with only 3 choices ?
a) First choice b) Second choice c) Last choice
3) True or False ?
a) True b) False";
// 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/