python - 如何在正则字符串中使用format()

Answer 1

In the format string, use '{{' to change to { , '}}' to change to }

Your example can be written like this:

"\d{{5}}_{name}_aaa".format(name=name)

Answer 2

Is this necessary?

Regular expressions are much more expressive than format, so there is no need to add superfluous information~