real-regex

A drop-in replacement for Python's re, backed by a linear-time, ReDoS-safe C++20 engine — with bounded lookarounds that the other linear-time engines (RE2, Rust) don't have.

pip install real-regex

Drop-in for re

Import it as re and use the API you already know — compile, search, match, fullmatch, findall, finditer, sub, subn, split, and Match.group / groups / groupdict / span / start / end:

import real as re

m = re.match(r"(\w+)@(\w+)\.(\w+)", "user@example.com")
m.group(1), m.group(2), m.group(3)          # ('user', 'example', 'com')

re.findall(r"\d+", "a1 b22 c333")            # ['1', '22', '333']
re.sub(r"\s+", "_", "a  b   c")              # 'a_b_c'

Flags work the same: re.I, re.M, re.S, re.X, re.A. Unicode \w \d \s \b and IGNORECASE case-folding follow re in text mode.

Why replace re

  • No ReDoS. re (like every backtracking engine) blows up on patterns like (a+)+b against a hostile input — seconds, then minutes. real-regex is a Thompson NFA simulation: linear time, always, no catastrophic backtracking, ever.
  • Bounded lookarounds, still linear. (?=…) (?!…) (?<=…) (?<!…) — including variable-width lookbehind — match without backtracking. RE2 and Rust drop lookarounds to stay safe; real-regex keeps them.
  • Faster than re on most work — the measured multiples (geometric mean, per-case wins and the two accepted losses) live in docs/BENCHMARKS.md §B. Sparse scans, multiline anchors and capture-dense extraction lead; a couple of high-volume split/tiny-anchored cases stay slower (CPython's C engine wins there). It is not the fastest engine at raw throughput — it is the safe one that is also quick.

Not re, on purpose

Strict by default — every accepted pattern is guaranteed linear. The unsupported constructs (backreferences, conditionals, non-binary Unicode properties like \p{Bidi_Class=L}) raise real.error rather than silently falling back to a backtracking engine, so a compiled pattern is a ReDoS-safety guarantee, not a maybe. (\p{L} / \p{sc=Greek} / \p{scx=Grek} / \p{Alphabetic} — General_Category, Script, Script_Extensions and the standard binary properties — are supported, a superset of stdlib re.) Opt into delegating those to the standard library re per call with real.compile(pat, fallback=True) (or module-wide with real.fallback = True) — it may accept them, at the cost of the linear-time guarantee for that pattern; Pattern.engine ("real" or "re") always tells you which backend you got. A few semantics differ deliberately (e.g. a nullable loop's final empty capture). Full list: COMPATIBILITY.md.

The wheel also ships the header-only C++ library — real.get_include() returns its path, so the same engine is available to C++ via #include <real/real.hpp>. Source, benchmarks and the C++ API: https://github.com/RECHE23/real-regex.

Project links

Data verified by PyPI on Aug 9, 2026
Data provided by the project maintainers, verified at the time the release was uploaded to PyPI.

Key dates

PyPI data
Data sourced directly from PyPI's database.
  • Released:
Newer release available (2026.8.17)

1 maintainer

PyPI data
Data sourced directly from PyPI's database.
Avatar for scientificlanguage from gravatar.com scientificlanguage

Credits

Author: René Chenard

GitHub Statistics

Data verified by PyPI on Aug 9, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License expression

MIT
View SPDX License List

Requires

Python >=3.10

Tags

regex regular-expression redos linear-time re

Classifiers

Report project as malware

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

real_regex-2026.8.11.tar.gz (599.0 kB view details)

Uploaded Source

Built Distributions

If you're not sure about the file name format, learn more about wheel file names.

real_regex-2026.8.11-cp310-abi3-win_amd64.whl (1.0 MB view details)

Uploaded CPython 3.10+Windows x86-64

real_regex-2026.8.11-cp310-abi3-win32.whl (972.5 kB view details)

Uploaded CPython 3.10+Windows x86

real_regex-2026.8.11-cp310-abi3-musllinux_1_2_x86_64.whl (4.1 MB view details)

Uploaded CPython 3.10+musllinux: musl 1.2+ x86-64

real_regex-2026.8.11-cp310-abi3-musllinux_1_2_aarch64.whl (3.9 MB view details)

Uploaded CPython 3.10+musllinux: musl 1.2+ ARM64

real_regex-2026.8.11-cp310-abi3-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl (3.0 MB view details)

Uploaded CPython 3.10+manylinux: glibc 2.24+ x86-64manylinux: glibc 2.28+ x86-64

real_regex-2026.8.11-cp310-abi3-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl (3.0 MB view details)

Uploaded CPython 3.10+manylinux: glibc 2.24+ ARM64manylinux: glibc 2.28+ ARM64

real_regex-2026.8.11-cp310-abi3-macosx_11_0_arm64.whl (826.0 kB view details)

Uploaded CPython 3.10+macOS 11.0+ ARM64

real_regex-2026.8.11-cp310-abi3-macosx_10_9_x86_64.whl (843.1 kB view details)

Uploaded CPython 3.10+macOS 10.9+ x86-64

File details

Details for the file real_regex-2026.8.11.tar.gz.

File metadata

  • Download URL: real_regex-2026.8.11.tar.gz
  • Upload date:
  • Size: 599.0 kB
  • Tags: Source
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/6.1.0 CPython/3.13.13

File hashes

Hashes for real_regex-2026.8.11.tar.gz
Algorithm Hash digest
SHA256 9235e7bd6637d9da37a791e6cf7b23085822e48b028642a88f13b429b8034ccf
MD5 bc761ee8f1edb387362e510db2f58b6b
BLAKE2b-256 bacb560737748a13917e638ccb94975c4118e9e534d72fda3b96675906ef46f7

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.11.tar.gz:

Publisher: release.yml on RECHE23/real-regex

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

File details

Details for the file real_regex-2026.8.11-cp310-abi3-win_amd64.whl.

File metadata

File hashes

Hashes for real_regex-2026.8.11-cp310-abi3-win_amd64.whl
Algorithm Hash digest
SHA256 b3cdf4a41f270fc84368b5b56bab6cf1c4035df0ed83713a3f56f3158294a2c6
MD5 f93f8c675054c128ea867e76133c4cda
BLAKE2b-256 f3ee9f5cc0a1270e7700f71a919305e103e0905f13f612710a46d846cf0954bc

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.11-cp310-abi3-win_amd64.whl:

Publisher: release.yml on RECHE23/real-regex

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

File details

Details for the file real_regex-2026.8.11-cp310-abi3-win32.whl.

File metadata

  • Download URL: real_regex-2026.8.11-cp310-abi3-win32.whl
  • Upload date:
  • Size: 972.5 kB
  • Tags: CPython 3.10+, Windows x86
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/6.1.0 CPython/3.13.13

File hashes

Hashes for real_regex-2026.8.11-cp310-abi3-win32.whl
Algorithm Hash digest
SHA256 356f79b2c2cd36a245c1efb9d92810d345e589392f9d5033df9bdc56116cb1ae
MD5 390d298e24444709eba247904aa4ea0e
BLAKE2b-256 ba5de865daf8f1f2a46a4af083761d9472d8985ad5cd7437c394e32a41a94609

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.11-cp310-abi3-win32.whl:

Publisher: release.yml on RECHE23/real-regex

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

File details

Details for the file real_regex-2026.8.11-cp310-abi3-musllinux_1_2_x86_64.whl.

File metadata

File hashes

Hashes for real_regex-2026.8.11-cp310-abi3-musllinux_1_2_x86_64.whl
Algorithm Hash digest
SHA256 bf02d6dd26d1ad2f6209817b6eda5b73b5e85188f5af40ff70c53d082aae9631
MD5 416d317e855d890668607b02e1bb51e7
BLAKE2b-256 aa6d2a2a767e59f6d501095f841fd11c55c85dd200800ae8b58e7e83e0f8d424

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.11-cp310-abi3-musllinux_1_2_x86_64.whl:

Publisher: release.yml on RECHE23/real-regex

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

File details

Details for the file real_regex-2026.8.11-cp310-abi3-musllinux_1_2_aarch64.whl.

File metadata

File hashes

Hashes for real_regex-2026.8.11-cp310-abi3-musllinux_1_2_aarch64.whl
Algorithm Hash digest
SHA256 50aca4018da9d0e827cc7beb52390f5a4e96b40f17595cccb4650cd2b80b080a
MD5 e32690071a282146b446c5554399c970
BLAKE2b-256 78c9615ff36e410f052ac7f0a37fd54b2aa22c2f9bb75c9e676db5506847445c

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.11-cp310-abi3-musllinux_1_2_aarch64.whl:

Publisher: release.yml on RECHE23/real-regex

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

File details

Details for the file real_regex-2026.8.11-cp310-abi3-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl.

File metadata

File hashes

Hashes for real_regex-2026.8.11-cp310-abi3-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl
Algorithm Hash digest
SHA256 223cb06d23ed985f6d234c1fb2c0e54c64c5717ada2f71f26c77b24cd178b7db
MD5 b05e8521f1c3b3312262c6eb9e7fa250
BLAKE2b-256 0bb18ed5c7b9856d513f6df2989672219c315be901c16dfbf21583f9e0e83b9a

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.11-cp310-abi3-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl:

Publisher: release.yml on RECHE23/real-regex

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

File details

Details for the file real_regex-2026.8.11-cp310-abi3-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl.

File metadata

File hashes

Hashes for real_regex-2026.8.11-cp310-abi3-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl
Algorithm Hash digest
SHA256 8f2ce1e5707b57b29378bf445deb2bb1a8797d4cef834faeeab277316841afc8
MD5 08eb3b0ca0c7afffc0f4f84a0ecb265c
BLAKE2b-256 2fa6a8af3ba29876124e828fb920c8d9e9b2344dae9e66b44a6837b88aeff281

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.11-cp310-abi3-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl:

Publisher: release.yml on RECHE23/real-regex

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

File details

Details for the file real_regex-2026.8.11-cp310-abi3-macosx_11_0_arm64.whl.

File metadata

File hashes

Hashes for real_regex-2026.8.11-cp310-abi3-macosx_11_0_arm64.whl
Algorithm Hash digest
SHA256 3a677b2114df3fe56b4abcbbe86d287119ef647f8900b06d64881ba2c8d2fe2f
MD5 65a78bcdb70f2acc6df2855c74f65c84
BLAKE2b-256 c217dd3dda977fa01f416c444773e0ba36cb40d8da87d86336af72ce4c9b21a7

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.11-cp310-abi3-macosx_11_0_arm64.whl:

Publisher: release.yml on RECHE23/real-regex

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

File details

Details for the file real_regex-2026.8.11-cp310-abi3-macosx_10_9_x86_64.whl.

File metadata

File hashes

Hashes for real_regex-2026.8.11-cp310-abi3-macosx_10_9_x86_64.whl
Algorithm Hash digest
SHA256 034372602ea59d6841bba4be604bf71d5579bdae2f7f4abe9259e427e81f7d8c
MD5 6241f708ab14805f35ac8e8c681369be
BLAKE2b-256 4eb1eb23eeca15f60765d5ffe7b0cd8b81053292e0ffface09cfe53f692a8492

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.11-cp310-abi3-macosx_10_9_x86_64.whl:

Publisher: release.yml on RECHE23/real-regex

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Release history Release notifications | RSS feed

2026.8.17

9 files

2026.8.16

9 files

2026.8.15

9 files

2026.8.14

9 files

2026.8.13

9 files

2026.8.12

9 files

This release

2026.8.11 This release

9 files

2026.8.10

9 files

2026.8.9

9 files

2026.8.8

9 files

2026.8.7

9 files

2026.8.6

9 files

2026.8.5

9 files

2026.8.4

9 files

2026.8.3

9 files

2026.8.2

9 files

2026.8.1

9 files

2026.8.0

9 files

2026.7.63

9 files

2026.7.62

9 files

2026.7.61

9 files

2026.7.60

9 files

2026.7.59

9 files

2026.7.58

9 files

2026.7.57

9 files

2026.7.56

9 files

2026.7.55

9 files

2026.7.54

9 files

2026.7.53

9 files

2026.7.52

9 files

2026.7.51

9 files

2026.7.50

9 files

2026.7.49

9 files

2026.7.48

9 files

2026.7.47

9 files

2026.7.46

9 files

2026.7.45

9 files

2026.7.44

9 files

2026.7.43

9 files

2026.7.42

9 files

2026.7.41

9 files

2026.7.40

9 files

2026.7.39

9 files

2026.7.38

9 files

2026.7.37

9 files

2026.7.36

9 files

2026.7.35

9 files

2026.7.34

9 files

2026.7.33

9 files

2026.7.32

9 files

2026.7.31

9 files

2026.7.30

9 files

2026.7.29

9 files

2026.7.28

9 files

2026.7.27

9 files

2026.7.26

9 files

2026.7.25

9 files

2026.7.24

9 files

2026.7.23

9 files

2026.7.22

9 files

2026.7.21

9 files

2026.7.20

9 files

2026.7.19

9 files

2026.7.18

9 files

2026.7.17

9 files

2026.7.16

9 files

2026.7.15

9 files

2026.7.14

9 files

2026.7.13

9 files

2026.7.12

9 files

2026.7.11

9 files

2026.7.10

9 files

2026.7.9

9 files

2026.7.8

9 files

2026.7.7

9 files

2026.7.6

9 files

2026.7.5

9 files

2026.7.4

9 files

2026.7.3

9 files

2026.7.2

9 files

2026.7.1

9 files

2026.7.0

9 files

2026.6.21

9 files

2026.6.20

9 files

2026.6.19

9 files

2026.6.18

9 files

2026.6.17

9 files

2026.6.16

9 files

2026.6.15

9 files

2026.6.14

9 files

2026.6.13

9 files

2026.6.12

9 files

2026.6.11

9 files

2026.6.10

9 files

2026.6.9

9 files

2026.6.8

9 files

2026.6.7

9 files

2026.6.6

9 files

2026.6.5

9 files

2026.6.4

9 files

2026.6.3

9 files

2026.6.2

9 files

2026.6.1

9 files

2026.6.0

9 files

Supported by

AWS Cloud computing and Security Sponsor Datadog Monitoring Depot Continuous Integration Fastly CDN Google Download Analytics Sentry Error logging StatusPage Status page