// 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"(?m)^question\s+(\d+),\s+chapter\s+(\d+)(?!(?:\n(?!question |solution ).*)*\nsolution for question \1)").unwrap();
let string = "question 1, chapter 1
...
solution for question 1, chapter 1
...
question 2, chapter 1
...
solution for question 2, chapter 1
...
question 3, chapter 1
...
question 4, chapter 1
...
solution for question 4, chapter 1
question 5, chapter 1
...
solution for question 5, chapter 1
question 6, chapter 1
question 7, chapter 1
...
solution for question 7, chapter 1
question 3, chapter 1
question 4, chapter 1
question 6, chapter 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/