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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.
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junyer Update Unicode data to 12.1.0.
Change-Id: I02e09f29d4d5af61a54bcf4ac55b474bcf50286b
Reviewed-by: Paul Wankadia <>
Latest commit c58f150 Jul 21, 2019
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benchlog benchlog: Add gnuplot support Jul 17, 2015
doc Update Unicode data to 12.1.0. Jul 21, 2019
kokoro Clarify the scope of a comment. Jan 31, 2019
lib/git Cleanup: Remove hg codereview extension. Apr 9, 2015
re2 Update Unicode data to 12.1.0. Jul 21, 2019
util Get rid of `using std::string;`. (part 7 of 7) Mar 18, 2019
.gitignore re2: exclude benchlog results in .gitignore Jul 10, 2015
.travis.yml Add GCC 9.x to the Travis CI matrix. May 22, 2019
AUTHORS re2: make tables const Jan 10, 2014
BUILD Add PODArray<> and make BitState use it. Aug 30, 2018
CMakeLists.txt Set an ALIAS and a NAMESPACE in the CMake configuration. Apr 19, 2019 re2: more Gerrit+GitHub integration Nov 20, 2014
CONTRIBUTORS Remove comparisons of this with NULL. Jun 26, 2014
LICENSE initial release Mar 3, 2010
Makefile Revert the commits for the shard_cache_mutex option. Dec 19, 2018
README Update the Erlang wrapper URL. Feb 13, 2019
WORKSPACE Add a workspace name based on Bazel guidelines Jul 1, 2016
libre2.symbols Include operator<<() for StringPiece in Jun 24, 2018
libre2.symbols.darwin Include operator<<() for StringPiece in Jun 24, 2018
re2.pc Plumb more variables from Makefile to re2.pc. May 9, 2016
re2_test.bzl regexp_benchmark doesn't need linkopts. Feb 18, 2018
runtests Kludge around System Integrity Protection on Darwin. Mar 4, 2018 Get rid of using-directives. Aug 7, 2016
ucs2.diff add ucs2.diff, showing old UCS-2 support Feb 7, 2012


This is the source code repository for RE2, a regular expression library.

For documentation about how to install and use RE2,

The short version is:

make test
make install
make testinstall

There is a fair amount of documentation (including code snippets) in
the re2.h header file.

More information can be found on the wiki:

Issue tracker:

Mailing list:

Unless otherwise noted, the RE2 source files are distributed
under the BSD-style license found in the LICENSE file.

RE2's native language is C++.

A C wrapper is at
An Erlang wrapper is at and on Hex (
An Inferno wrapper is at
A Node.js wrapper is at and on NPM (
An OCaml wrapper is at and on OPAM (
A Perl wrapper is at and on CPAN (
A Python wrapper is at and on PyPI (
An R wrapper is at and on CRAN (
A Ruby wrapper is at and on RubyGems (
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