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我正在尝试创建一个 telnet 客户端，它将尝试默认用户名和密码并返回正确的用户名，但似乎 pythontelnetlib Telnet.expect()方法没有捕捉到我不明白为什么的正则表达式模式。相反，期望始终返回 -1 作为第一个索引，这意味着未找到该模式。

try:
        result = telnet.expect([b"(?i)login:", b"(?i)password:"], timeout=2)
        if result[0] == 0:
            <..snip..>
  # This is the important part which get executed.I'm sure that python
  # enter this part of elif print statement get's executed
        elif result[0] == 1:
            telnet.write(bytes(password, encoding="ascii"))
            result = telnet.expect([b"(?i)Login OK!"], timeout=3)
# This print output is
            print(result[2])
            if result[0] == 0:
                print(f"[+] Telnet Host:{username}:{port}, username:{username} password:{password}")

我的 Linux telnet 客户端可以正常工作

telnet 192.168.1.104 23456
Trying 192.168.1.104...
Connected to 192.168.1.104.
Escape character is '^]'.
Welcome to Telnetd :-)
Password:root
*
Login OK!
:/ $

result[2] 的打印输出为：

b'\x08 \x08*\x08 \x08*\x08 \x08*\x08 \x08*\x08 \x08*\x08 \x08*'
b'\x08 \x08*\x08 \x08*\x08 \x08*\x08 \x08*'
b'\x08 \x08*\x08 \x08*\x08 \x08*\x08 \x08*'
b'\x08 \x08*\x08 \x08*\x08 \x08*\x08 \x08*\x08 \x08*\x08 \x08*\x08 \x08*\x08 \x08*'
b'\x08 \x08*\x08 \x08*\x08 \x08*\x08 \x08*\x08 \x08*\x08 \x08*\x08 \x08*\x08 \x08*'
<..snip..>

我想问题出在我应该捕获的正则表达式上，Login OK!但我看不出那个错误是什么。

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