add regex

regex/src/main.rs

@@ -7,6 +7,8 @@ On 2010-03-14, foo happened. On 2014-10-14, bar happened.
 fn main() {
     let re = Regex::new(r"(\d{4})-(\d{2})-(\d{2})").unwrap();
     
+    // year: 2010, month: 03, day: 14
+    // year: 2014, month: 10, day: 14
     for caps in re.captures_iter(TO_SEARCH) {
         println!("year: {}, month: {}, day: {}",
              caps.get(1).unwrap().as_str(),
@@ -24,4 +26,15 @@ fn main() {
 
     let re3 = Regex::new(r"(?P<x>\d+)").unwrap();
     println!("{}", re3.replace_all("Hello 100, 200", "<$x>"));
+
+    let e = "name@example.com";
+    let re_e = Regex::new(r"^(\w+)@((\w+)*\.com)$").unwrap();
+    // name -> name
+    // domain -> example.com
+    // domain -> example
+    for cap in re_e.captures_iter(e) {
+        println!("name -> {}", cap.get(1).unwrap().as_str());
+        println!("domain -> {}", cap.get(2).unwrap().as_str());
+        println!("domain -> {}", cap.get(3).unwrap().as_str());
+    }
 }