API: Deprecate regex=True default in Series.str.replace
From some old discussion it looks like there was interest in changing the default value of regex from True to False within Series.str.replace. I think this makes sense since it would align this method with others within pandas along with the standard library, and would also make fixing https://github.com/pandas-dev/pandas/issues/24804 slightly less disruptive. I'm assuming this would warrant a deprecation note in the next whatsnew?

I think this part of the docs will need to be updated: https://pandas.pydata.org/pandas-docs/stable/user_guide/text.html#splitting-and-replacing-strings

https://github.com/pandas-dev/pandas/pull/24809