// 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"(?xm)^ # beginning of string
(?:
. # match a single character
(?=
.*?
# if we already have captured the end of the string
(?(1)
# make sure we do not go past the correct position
(?= .\1$ )
)
# capture the end of the string +1 character, adding to \1 every iteration
( .\1?$ )
)
)* # repeat
# the middle character follows, capture it
(.)").unwrap();
let string = "1
123
12345
1234567
123456789
12345678901
1234567890123
123456789012345
";
// 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/