BUG: Fix Series.str.contains with compiled regex on Arrow string dtype (#61942)

Author: Aniketsy

doc/source/whatsnew/v2.3.2.rst

@@ -26,6 +26,7 @@ Bug fixes
   "string" type in the JSON Table Schema for :class:`StringDtype` columns
   (:issue:`61889`)
 - Boolean operations (``|``, ``&``, ``^``) with bool-dtype objects on the left and :class:`StringDtype` objects on the right now cast the string to bool, with a deprecation warning (:issue:`60234`)
+- Fixed ``Series.str.contains`` with compiled regex on Arrow string dtype, which now correctly delegates to the object-dtype implementation. (:issue:`61942`)
 
 .. ---------------------------------------------------------------------------
 .. _whatsnew_232.contributors:

pandas/tests/strings/test_find_replace.py

@@ -283,18 +283,17 @@ def test_contains_nan(any_string_dtype):
 
 def test_str_contains_compiled_regex_arrow_dtype(any_string_dtype):
     # GH#61942
+    if any_string_dtype == "string[pyarrow]":
+        pytest.importorskip("pyarrow")
     ser = Series(["foo", "bar", "baz"], dtype=any_string_dtype)
     pat = re.compile("ba.")
     result = ser.str.contains(pat)
     # Determine expected dtype and values
-    if any_string_dtype == "string[pyarrow]":
-        expected_dtype = "bool[pyarrow]"
-    elif any_string_dtype == "string":
-        expected_dtype = "boolean"
-    elif any_string_dtype == "str":
-        expected_dtype = bool
-    else:
-        expected_dtype = object
+    expected_dtype = {
+        "string[pyarrow]": "bool[pyarrow]",
+        "string": "boolean",
+        "str": bool,
+    }.get(any_string_dtype, object)
     expected = Series([False, True, True], dtype=expected_dtype)
     assert str(result.dtype) == str(expected.dtype)
     tm.assert_series_equal(result, expected)