Python Regex查找换行符的单次出现

Question

我有这个字符串

4
00:00:43,520 --> 00:00:45,193
<i>and he lives by...</i>

5
00:00:45,280 --> 00:00:46,280
Bounty Law.

6
00:00:46,880 --> 00:00:48,951
You don't ever bring them in alive,
do you, Jake?

时间过后，我必须访问对话。