// 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"(?u)(?<![\p{L}0-9])([#＃][·・ー_0-9０-９a-zA-Zａ-ｚＡ-Ｚぁ-んァ-ン一-龠]{1,24})(?![\p{L}0-9])").unwrap();
let string = "Hashtag must be started with # character.
Hashtag will be detected by space character and other special characters (!,@,&,*,%,$).
Example 1: Hello#guys. This is a #test. -> Valid hashtag: #test.
Example 2: Hello#guys. This is a #test!#message. -> Valid hashtag: #test and #message
Example 3: Hello#guys. This is a #test #message. -> Valid hashtag: #test and #message
Example 4: Hello#guys. This is a #test#message. -> Valid hashtag: #test
Example 5: #asdasdasdasdasdasdasdasdasd -> Valid hashtag: none
Example 6: # -> Valid hashtag: none
#日本語#asd => Valid hashtag should be #日本語
#日本語日本語日本語日本語日本語日本語日本語日本語日本語 => Will not a valid hashtag";
// 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/