[Python] why are these python regex not the same: '\.0$' vs r'.0$' [duplicate]

We have this existing regex:

re.sub('\.0$', '', v)

But it has a flake8 issue:

invalid escape sequence '\.'

So I thought the fix would be:

re.sub(r'.0$', '', v)

But it's not.

When I pass in 19950620 as the input, the "old" regex would return 19950620.

But using the "raw string" method, I get back 199506.

So that makes these two regexs not the same.

What gives?

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