Removed deprecated multi-pattern overload of replace_re

[davidwendt]

Description

Removes the multi-pattern version of the cudf::strings::replace_re API which was deprecated in 26.06

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[copy-pr-bot]

Auto-sync is disabled for draft pull requests in this repository. Workflows must be run manually.

Contributors can view more details about this message here.

[davidwendt]

Breaking label still breaking the "Trigger Breaking Change Notifications" GHA when PR is in draft.
Will try to remember to change the label when removing from draft.

[davidwendt]

This change will help remove some complexity from #21936

[davidwendt]

/ok to test

[davidwendt]

/ok to test

[davidwendt]

/ok to test

[KyleFromNVIDIA]

Approved trivial CMake changes

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 30aff625-86b1-4908-bf63-a5d292fcdc20

📥 Commits

Reviewing files that changed from the base of the PR and between 00327e6 and 5a61a46.

📒 Files selected for processing (1)

• python/cudf/cudf/core/accessors/string.py

🚧 Files skipped from review as they are similar to previous changes (1)

• python/cudf/cudf/core/accessors/string.py

---

📝 Walkthrough

Summary by CodeRabbit

• Breaking Changes

  • Multi-pattern regex replacement removed across all language bindings; only single-pattern replacement with compiled regex programs is supported.

• Behavior Change

  • Supplying list-style patterns with regex=True now raises a ValueError (docstrings updated).

• Tests

  • Removed tests exercising multi-pattern regex replacement.

• Documentation

  • Docstrings and stub signatures updated to reflect the narrowed API.

Walkthrough

This pull request removes the multi-pattern regex replacement API across C++, Java, and Python, narrowing replace_re to accept a single precompiled regex_program and a scalar replacement; related JNI, bindings, overloads, and tests for multi-pattern behavior are removed or simplified.

Changes

Multi-pattern regex replacement removal

Layer / File(s)	Summary
C++ API contract narrowing cpp/include/cudf/strings/replace_re.hpp, cpp/CMakeLists.txt	Header removes deprecated multi-pattern overload and declares single regex_program-based replace_re signature; CMake switches source from multi_re.cu to multi.cu.
Java binding layer removal java/src/main/java/ai/rapids/cudf/ColumnView.java, java/src/main/native/src/ColumnViewJni.cpp, java/src/test/java/ai/rapids/cudf/ColumnVectorTest.java	JNI wrapper replaceMultiRegex and Java test case deleted; Java wrapper formatting and native declarations adjusted to reflect narrowed C++ API.
cudf high-level Python API python/cudf/cudf/core/accessors/string.py, python/cudf/cudf/core/column/string.py	StringColumn.replace_re signature narrowed to (pattern: str, replacement: str); StringMethods.replace now raises ValueError for list-like pat/repl when regex=True.
Python pylibcudf Cython binding python/pylibcudf/pylibcudf/libcudf/strings/replace_re.pxd, python/pylibcudf/pylibcudf/strings/replace_re.pxd, python/pylibcudf/pylibcudf/strings/replace_re.pyx	Extern declaration and pyx wrapper updated to accept regex_program + string_scalar/Scalar; fused-type overloads, vector import, and regex_flags pathway removed; implementation simplified to single call into C++.
Python pylibcudf type stubs python/pylibcudf/pylibcudf/strings/replace_re.pyi	Overload-based stub removed; single declaration exposing RegexProgram and Scalar parameters remains.
Test and documentation updates python/pylibcudf/tests/test_string_replace_re.py	SPDX year extended to 2026; parametrized test covering list-of-patterns/list-of-replacements removed.

---

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the primary change: removal of the deprecated multi-pattern overload of the replace_re function across multiple layers (C++, Python, Java).
Description check	✅ Passed	The description is directly related to the changeset, clearly stating the removal of the multi-pattern version of the replace_re API that was deprecated in version 26.06.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@python/cudf/cudf/core/accessors/string.py`:
- Around line 1035-1038: The string accessor replace implementation now raises
ValueError when list-like pat/repl are used together with regex=True; update the
docstring for the replace method in cudf/core/accessors/string.py
(Series.str.replace) to explicitly document that list-like pat/repl are not
supported when regex=True and that regex defaults to True, and add a cudf-level
regression test (e.g., in tests/string/test_replace.py) that calls
Series.str.replace([...], [...], regex=True) and asserts it raises ValueError to
prevent regressions.

In `@python/pylibcudf/pylibcudf/strings/replace_re.pyx`:
- Around line 61-70: The code currently casts replacement to a string_scalar*
without validating its type, which can cause UB; before entering the with nogil:
block in replace_re, check that replacement is either None or a string Scalar
(e.g., ensure replacement.type corresponds to string/string_scalar) and raise a
Python-level TypeError if not, then only pass
dereference(<string_scalar*>(replacement.get())) to cpp_replace_re.replace_re
when the check has succeeded (or alternatively change the Cython signature to
accept a string_scalar specifically); ensure the validation happens on the
Python side before the with nogil: to avoid performing type checks without the
GIL.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: b98da430-97e4-4a65-a72e-a6d9f9e20205

📥 Commits

Reviewing files that changed from the base of the PR and between 3cfe15b and 1c84806.

📒 Files selected for processing (13)

• cpp/CMakeLists.txt
• cpp/include/cudf/strings/replace_re.hpp
• cpp/src/strings/replace/multi_re.cu
• java/src/main/java/ai/rapids/cudf/ColumnView.java
• java/src/main/native/src/ColumnViewJni.cpp
• java/src/test/java/ai/rapids/cudf/ColumnVectorTest.java
• python/cudf/cudf/core/accessors/string.py
• python/cudf/cudf/core/column/string.py
• python/pylibcudf/pylibcudf/libcudf/strings/replace_re.pxd
• python/pylibcudf/pylibcudf/strings/replace_re.pxd
• python/pylibcudf/pylibcudf/strings/replace_re.pyi
• python/pylibcudf/pylibcudf/strings/replace_re.pyx
• python/pylibcudf/tests/test_string_replace_re.py

💤 Files with no reviewable changes (8)

• cpp/CMakeLists.txt
• cpp/include/cudf/strings/replace_re.hpp
• python/pylibcudf/pylibcudf/libcudf/strings/replace_re.pxd
• python/pylibcudf/pylibcudf/strings/replace_re.pyi
• cpp/src/strings/replace/multi_re.cu
• java/src/main/native/src/ColumnViewJni.cpp
• java/src/test/java/ai/rapids/cudf/ColumnVectorTest.java
• java/src/main/java/ai/rapids/cudf/ColumnView.java

[GregoryKimball]

@mythrocks (@sameerz ) We are planning to remove the JNI binding and would like your feedback.

[coderabbitai]

Actionable comments posted: 0

[davidwendt]

/merge