jorisvandenbossche commented on pull request #8459:
URL: https://github.com/apache/arrow/pull/8459#issuecomment-823545315
One thing I noted while quickly trying it out:
```
In [6]: pc.extract_regex(pa.array(['a1', 'b2', 'c3']),
regex=r'(?P<letter>[ab])?(?P<digit>\d)')
Out[6]:
<pyarrow.lib.StructArray object at 0x7f8c1bdf9760>
-- is_valid: all not null
-- child 0 type: string
[
"a",
"b",
""
]
-- child 1 type: string
[
"1",
"2",
"3"
]
```
When having an optional group like the above, I would maybe expect a null
instead of an empty string in the first child?
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