// 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)^(?!(?:From|To|Subject|References):)[^:\n]*:\s*\K[^\n]*").unwrap();
let string = "A date
From: One line of text
To: One or more lines
Subject: One or more lines
References: One or more lines
Paragraph 1 Title:
A paragraph
Paragraph 2 Title: Another paragraph
…. Etc";
// 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/