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BUG FIX: Using Series.str.fullmatch() and Series.str.match() with a compiled regex fails with arrow strings #61964

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BUG FIX: Using Series.str.fullmatch() and Series.str.match() with a compiled regex fails with arrow strings #61964

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920aa10
str.fullmatch() and str.match() with complied regex fix issue 61952
Jul 26, 2025
56e0280
Merge remote-tracking branch 'upstream/main' into issue_61952
Jul 27, 2025
bf6da3b
moved new tests to strings/test_find_replace.py
Jul 27, 2025
f08bfd1
added docs to accessor.py/match()
Jul 27, 2025
52b9123
Merge remote-tracking branch 'upstream/main' into issue_61952
Jul 30, 2025
a336ccb
added type annotation and minor docstring changes
Jul 30, 2025
4aaa889
fixed mypy check
Jul 30, 2025
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8 changes: 7 additions & 1 deletion pandas/core/arrays/_arrow_string_mixins.py
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Original file line number Diff line number Diff line change
Expand Up @@ -304,11 +304,14 @@ def _str_contains(

def _str_match(
self,
pat: str,
pat,
case: bool = True,
flags: int = 0,
na: Scalar | lib.NoDefault = lib.no_default,
):
if isinstance(pat, re.Pattern):
# GH#61952
pat = pat.pattern
if not pat.startswith("^"):
pat = f"^{pat}"
return self._str_contains(pat, case, flags, na, regex=True)
Expand All @@ -320,6 +323,9 @@ def _str_fullmatch(
flags: int = 0,
na: Scalar | lib.NoDefault = lib.no_default,
):
if isinstance(pat, re.Pattern):
# GH#61952
pat = pat.pattern
if not pat.endswith("$") or pat.endswith("\\$"):
pat = f"{pat}$"
return self._str_match(pat, case, flags, na)
Expand Down
8 changes: 8 additions & 0 deletions pandas/tests/extension/test_arrow.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1857,6 +1857,10 @@ def test_str_repeat():
["ab", False, True, [True, True]],
["a[a-z]{1}", False, None, [True, None]],
["A[a-z]{1}", True, None, [False, None]],
# GH#61952
[re.compile(r"ab"), False, None, [True, None]],
[re.compile(r"Abc"), True, None, [False, None]],
[re.compile(r"a[a-z]{1}"), False, None, [True, None]],
],
)
def test_str_match(pat, case, na, exp):
Expand All @@ -1880,6 +1884,10 @@ def test_str_match(pat, case, na, exp):
["abc\\$", False, None, [False, True, False, None]],
["Abc$", True, None, [False, False, False, None]],
["Abc\\$", True, None, [False, False, False, None]],
# GH#61952
[re.compile(r"abc"), False, None, [True, True, False, None]],
[re.compile(r"abc$"), False, None, [True, False, False, None]],
[re.compile(r"a[a-z]{2}"), False, None, [True, True, False, None]],
],
)
def test_str_fullmatch(pat, case, na, exp):
Expand Down
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