CodeTest/leetcode/find-the-index-of-the-first-occurrence-in-a-string/solution_1386434926.rs

use regex::Regex;

impl Solution {
    pub fn str_str(haystack: String, needle: String) -> i32 {
        let re = Regex::new(needle.as_str()).unwrap();
        match re.find(haystack.as_str()){
            Some(mat) => mat.start() as i32,
            None => -1
        }
    }
}