// 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)From:\s+(?<from>.*?)\s+To:\s+(?<to>.*?)\s+Subject:\s+(?<subject>.*?)(?:\s+References: (?<ref>.*?))?$").unwrap();
let string = "Text of variable length spread across several lines Serialization-type text separated by colons (eg ABC:DEF:GHI) A date
From: One line of text To: One or more lines Subject: One or more lines References: One or more lines
From: One line of text To: One
or
more
lines Subject: One or more lines References: One or more lines
From: One line of text To: One or more lines Subject: No references.
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";
// 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/