mschwedeler opened a new issue, #38150:
URL: https://github.com/apache/arrow/issues/38150
### Describe the bug, including details regarding any error messages,
version, and platform.
System details:
```
pyarrow: 13.0.0
platform: macOS-12.6.9-arm64-arm-64bit
python: 3.9.13
```
This is as expected:
```python
import re
print(re.findall(r'\bm\b', 'méxico'))
# []
```
This is unexpected:
```python
import pyarrow as pa
print(
pa.compute.match_substring_regex(
pa.array(
[
"méxico",
]
), pattern=r'\bm\b'
)
# <pyarrow.lib.BooleanArray object at 0x4585c27c0>
# [
# true
# ]
```
### Component(s)
Python
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