Use lazy_static! to avoid expensive regex compiles in loop

src/message.rs

@@ -6,6 +6,7 @@ use tokio_tungstenite::{
     tungstenite::Message as WsMessage,
 };
 use futures::{StreamExt, SinkExt};
+use lazy_static::lazy_static;
 
 #[derive(PartialEq, Debug)]
 pub struct Message {
@@ -25,8 +26,10 @@ pub enum Error {
 
 impl Message {
     pub fn parse(text: String) -> Result<Message> {
-	let re = regex::Regex::new(r"^([A-Z_]+):\s*(.*)").unwrap();
-	match re.captures(text.as_str()) {
+        lazy_static! {
+            static ref RE: regex::Regex = regex::Regex::new(r"^([A-Z_]+):\s*(.*)").unwrap();
+        }
+	match RE.captures(text.as_str()) {
             Some(captures) => {
 		if captures.len() < 3 {
 		    Err(Error::BadParse)