google/re2

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RE2 is a fast, safe, thread-friendly alternative to backtracking regular expression engines like those used in PCRE, Perl, and Python. It is a C++ library.

Stars: 9.8k
Forks: 1.2k
Open beginner issues: 0
Indexed issues: 31

Dominant language: C++
License: BSD-3-Clause
Last GitHub push: Jan 22, 2026
Latest indexed: Sep 16, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

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31 open issues indexed

Google Open

Difficulty 5/5 Over a week Newbie friendliness 10/100

google/re2#660 · Opened Sep 10, 2026
setup.py: setuptools fallback does not link abseil when building against static libre2.a Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

google/re2#651 · Opened Jul 29, 2026
Python 3.15, MacOS build error Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

google/re2#647 · 3 comments · Opened Jul 2, 2026
bestmod breaking Open

Difficulty 4/5 3-5 days Newbie friendliness 15/100

google/re2#642 · 2 comments · Opened Jun 20, 2026
proposal: support the `x` flag Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

google/re2#638 · Opened Jun 4, 2026
re2.h is totally unreadable, so "Please see re2.h for [flags] documentation" is a useless statement Open

Difficulty 3/5 1-2 days Newbie friendliness 50/100

google/re2#633 · Opened May 12, 2026
Abseil LTS 20260107 deprecates MutexLock(Mutex*) and bare Mutex::ReaderLock() / WriterLock() / *Unlock() — used in re2/dfa.cc Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

google/re2#631 · Opened May 11, 2026
Install fail on node 26 Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

google/re2#629 · Opened May 8, 2026
[Windows][MSVC] Failed to build Google_RE2 with error C2665: 'absl::lts_20250127::MutexLock::MutexLock': no overloaded function could convert all the argument types Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

google/re2#628 · Opened May 8, 2026
roobes.xoxdev Open

Difficulty 5/5 Over a week Newbie friendliness 5/100

google/re2#622 · Opened Apr 21, 2026
Afyasmart backend Open

Difficulty 5/5 Over a week Newbie friendliness 10/100

google/re2#620 · Opened Apr 4, 2026
CONTRIBUTING: document the 'sam' tool Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

google/re2#618 · 4 comments · Opened Apr 4, 2026
doc: document repeat limit for nested repetitions Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

google/re2#617 · Opened Apr 4, 2026
Bug: Self-move-assignment in RE2::Set and FilteredRE2 causes use-after-destroy Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

google/re2#615 · 1 comment · Opened Mar 30, 2026
Bug: FilteredRE2::AllMatches and AllPotentials missing compiled_ check Open

Difficulty 2/5 1-3 hours Newbie friendliness 75/100

google/re2#613 · Opened Mar 30, 2026
Bug: Workq::mark() sets last_was_mark_ to false instead of true Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

google/re2#611 · Opened Mar 30, 2026
Morgan Ketzner ™® Open

Difficulty 5/5 Over a week Newbie friendliness 1/100

google/re2#608 · 1 reaction · Opened Mar 19, 2026
aredbera Open

Difficulty 5/5 Over a week Newbie friendliness 1/100

google/re2#606 · 2 comments · Opened Mar 12, 2026
GlobalReplace with patterns ending in .*$ scans entire input through BitState unnecessarily Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

google/re2#605 · 2 comments · 1 reaction · Opened Mar 11, 2026
Python FR: Add support for Python 3.14 free-threaded mode Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

google/re2#602 · 1 comment · Opened Feb 24, 2026
https://github.com/google/re2.wiki.git Open

Difficulty 5/5 Over a week Newbie friendliness 1/100

google/re2#600 · Opened Feb 21, 2026
T Open

Difficulty 5/5 Over a week Newbie friendliness 1/100

google/re2#598 · Opened Feb 18, 2026
Segfault in RE2 compiler when compiling a crafted regex Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

google/re2#596 · 1 comment · Opened Feb 2, 2026
When using the re2 Python bindings, replacing the anchor "$" with re2.subn inserts the replacement twice Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

google/re2#595 · 1 comment · 2 reactions · Opened Feb 2, 2026
Hexadecimal ints not handled? Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

google/re2#593 · Opened Jan 30, 2026
Null-deref in RE2 DFA/hash-set teardown triggered by extremely small max_mem option Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

google/re2#589 · Opened Jan 8, 2026
Provide musl linux python wheels Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

google/re2#587 · 1 comment · 1 reaction · Opened Jan 6, 2026
Bounded Lookaround Implementation - Proof of Concept Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

google/re2#585 · 1 comment · 4 reactions · Opened Nov 26, 2025
pip install from git missing pybind11/buffer_info.h Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

google/re2#581 · 7 comments · 2 reactions · Opened Nov 7, 2025
Lock contention when re2:RE2 object is shared between threads Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

google/re2#569 · 3 reactions · Opened Sep 5, 2025
Python typestubs Open

help wanted

Difficulty 4/5 3-5 days Newbie friendliness 25/100

google/re2#496 · 14 comments · 3 reactions · Opened May 31, 2024

google/re2

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