Series.str.contains Question
#### Not contains Question

```python
    # df is a DataFrame contains column "title", then I filter df by column "title" below, it works.
    useless = df[df["title"].str.contains(r"[\d]+[册|本]", regex=True)]
    # but I want a not contains value below, it raise error: ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().
    useless = df[not df["title"].str.contains(r"[\d]+[册|本]", regex=True)]
  
```
#### Problem description

How can I get a not contains value?
