// 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"(?xmi)^ # begin of string
(?:(?!(?:\1|\2|\3)).)*? # ungreedy anything that is not captured by group 1,2,or 3
( # 1th capturing group
(?:\brain\b|\bsunlight\b|\bbark) # Alternation group (answers) \b word-boundaries as needed
)
(?:(?!(?:\1|\2|\3)).)*? # ungreedy anything that is not captured by group 1,2,or 3
( # 3th capturing group
(?:(?!(?:\1|\3))(?:\brain\b|\bsunlight\b|\bbark)) # Answers not captured in group 1 or 3
)
(?:(?!(?:\1|\2|\3)).)*? # ungreedy anything that is not captured by group 1,2,or 3
( # 4th capturing group
(?:(?!(?:\2|\3))(?:\brain\b|\bsunlight\b|\bbark)) # Answers not captured by group 2 or 3
)
(?:(?!(?:\1|\2|\3)).)* # anything that is not captured by group 1,2,or 3
$ # end of string").unwrap();
let string = "rain. bright sunlight. a dog's bark.
rain. bright rain. a dog's bark.
Barksunlight rain
bark sun rain
bar sunlight sunlight
Rain rain rain
sunlight rain bark
Barking dog, sunlight, rainforest
Barking elephant, green Sunlight, purple rain and other non-sense
";
// 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/