I have a script that loops over several search/replace regex in python, one of those operations is remove trailing spaces
I've tried:

```python
re.sub(r"""\s+$""", '', str)

re.sub(r""" +$""", r"""""", str)

```

and

```
re.sub(r""" +$""", r"""""", str, re.M)

```

I found several answers that simply recommended using `strip` my problem is that I want to integrate this in the regex replace mechanism.