Fix #61072: inconsistent fullmatch results with regex alternation #61343
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…nation in PyArrow strings Fixes an issue where regex patterns with alternation (|) produce different results between str dtype and string[pyarrow] dtype. When using patterns like "(as)|(as)", PyArrow implementation would incorrectly match "asdf" while Python's implementation correctly rejects it. The fix adds special handling to ensure alternation patterns are properly parenthesized when using PyArrow-backed strings
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in PyArrow strings
Fixes an issue where regex patterns with alternation (|) produce different results between str dtype and string[pyarrow] dtype. When using patterns like "(as)|(as)", PyArrow implementation would incorrectly match "asdf" while Python's implementation correctly rejects it. The fix adds special handling to ensure alternation patterns are properly parenthesized when using PyArrow-backed strings