Python正则表达式引用子组匹配有数量限制？

Answer 1

Because 10 不是 00.

The content in your second capture group is 00，当然就不匹配 10 了。引用捕获组的时候，要求此处和指定组是相同的文本，而不是它们符合相同的模式。比如 (.)1 Matches two consecutive identical characters.

Answer 2

Shouldn’t 00:00:00,000 and 00:00:10:000 just use the same pattern?
I have run the following pattern on both the website and the Python script you gave me, and it can match.

(\d{1,3})\n(\d{2}):(\d{2}):(\d{2}),(\d{3}) --> (\d{2}):(\d{2}):(\d{2}),(\d{3})