问Twitch IRC聊天机器人成功连接，但未检测到命令

EN

import re
from time import sleep
import socket


HOST = "irc.twitch.tv"
PORT = 6667
NICK = "bot_name"
PASS = "oauth:..."
CHAN = "#channel"
RATE = (20 / 30)
CHAT_MSG = re.compile(r"^:\w+!\w+@\w+\.tmi\.twitch\.tv PRIVMSG #\w+ :")


def main_loop():
    try:
        s = socket.socket()
        s.connect((HOST, PORT))
        s.send("PASS {}\r\n".format(PASS).encode("utf-8"))
        s.send("NICK {}\r\n".format(NICK).encode("utf-8"))
        s.send("JOIN {}\r\n".format(CHAN).encode("utf-8"))
        connected = True
    except Exception as e:
        print(str(e))
        connected = False

    while connected:
        response = s.recv(1024).decode("utf-8")
        if response == "PING :tmi.twitch.tv\r\n":
            s.send("PONG :tmi.twitch.tv\r\n".encode())
            print("PONG")
        else:
            username = re.search(r"\w+", response).group(0)
            message = CHAT_MSG.sub("", response)

            if message == "!test":
                chat(s, "Testing command received!")

            print(username + ": " + message)
        sleep(1)


def chat(sock, msg):
    sock.send("PRIVMSG {} :{}".format(CHAN, msg).encode())


if __name__ == "__main__":
    main_loop()