Offset overflow while doing regex on a text column

### Describe the bug

`ArrowInvalid: offset overflow while concatenating arrays`

Same error as [here](https://github.com/huggingface/datasets/issues/615)

### Steps to reproduce the bug

Steps to reproduce: (dataset is a few GB big so try in colab maybe)

```
import datasets
import re

ds = datasets.load_dataset('nishanthc/dnd_map_dataset_v0.1', split = 'train')

def get_text_caption(example):
regex_pattern = r'\s\d+x\d+|,\sLQ|,\sgrid|\.\w+$'
example['text_caption'] = re.sub(regex_pattern, '', example['picture_text'])
return example

ds = ds.map(get_text_caption)
```

I am trying to apply a regex to remove certain patterns from a text column. Not sure why this error is showing up.

### Expected behavior

Dataset should have a new column with processed text

### Environment info

Datasets version - 2.11.0