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 3, 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 3, 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-2026.8.3.tar.gz (561.3 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-2026.8.3-cp310-abi3-win_amd64.whl (959.3 kB view details)

Uploaded CPython 3.10+Windows x86-64

real_regex-2026.8.3-cp310-abi3-win32.whl (926.3 kB view details)

Uploaded CPython 3.10+Windows x86

real_regex-2026.8.3-cp310-abi3-musllinux_1_2_x86_64.whl (4.0 MB view details)

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

real_regex-2026.8.3-cp310-abi3-musllinux_1_2_aarch64.whl (3.9 MB view details)

Uploaded CPython 3.10+musllinux: musl 1.2+ ARM64

real_regex-2026.8.3-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-2026.8.3-cp310-abi3-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl (2.9 MB view details)

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

real_regex-2026.8.3-cp310-abi3-macosx_11_0_arm64.whl (775.2 kB view details)

Uploaded CPython 3.10+macOS 11.0+ ARM64

real_regex-2026.8.3-cp310-abi3-macosx_10_9_x86_64.whl (789.4 kB view details)

Uploaded CPython 3.10+macOS 10.9+ x86-64

File details

Details for the file real_regex-2026.8.3.tar.gz.

File metadata

  • Download URL: real_regex-2026.8.3.tar.gz
  • Upload date:
  • Size: 561.3 kB
  • Tags: Source
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/6.1.0 CPython/3.13.13

File hashes

Hashes for real_regex-2026.8.3.tar.gz
Algorithm Hash digest
SHA256 04b141ecc135188af98f5a2c5c93f65371a7d324e6a39c726f9abf9958141843
MD5 49b24d47a67a2e136e0955ca427a83ee
BLAKE2b-256 aa74fa95da1706dd70cebbfbe7049bdd47b674ddab6660e4c7274c3590a872ec

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.3.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-2026.8.3-cp310-abi3-win_amd64.whl.

File metadata

File hashes

Hashes for real_regex-2026.8.3-cp310-abi3-win_amd64.whl
Algorithm Hash digest
SHA256 0ab00e48d428c524490931f8343cfc25504197bcba9693cbe67751db7f97669c
MD5 44bb4229005e6cb73982aa72a2128c78
BLAKE2b-256 120c4a158502fc271329afee82a6ba73eb36fc5c3fc60aba81296bc4c6b34e2f

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.3-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-2026.8.3-cp310-abi3-win32.whl.

File metadata

  • Download URL: real_regex-2026.8.3-cp310-abi3-win32.whl
  • Upload date:
  • Size: 926.3 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-2026.8.3-cp310-abi3-win32.whl
Algorithm Hash digest
SHA256 b27c58774b29fd5aa1b6bd4908044c0bdb5dec40b0b2fa01cd645aa474ce6364
MD5 17d892a4c8686dd862d9fc73c3a26bed
BLAKE2b-256 d3367b129a57de5f9b2cea813e57ad16d50b10854b9ca3a089abbdf3566140c2

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.3-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-2026.8.3-cp310-abi3-musllinux_1_2_x86_64.whl.

File metadata

File hashes

Hashes for real_regex-2026.8.3-cp310-abi3-musllinux_1_2_x86_64.whl
Algorithm Hash digest
SHA256 20620a112423e1628083d62da7b5e3a2e7a80eb3fca2b4de962c7f437a2d0aca
MD5 03a4d60191dcefe09418a649a363e671
BLAKE2b-256 25728221182b83f3bd0554f7ed39a46ff175c6831bf1cb69c7ca255e8c7957a0

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.3-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-2026.8.3-cp310-abi3-musllinux_1_2_aarch64.whl.

File metadata

File hashes

Hashes for real_regex-2026.8.3-cp310-abi3-musllinux_1_2_aarch64.whl
Algorithm Hash digest
SHA256 c6b95f06aa437fde0974709a787bb49a80d9f6cc9b9cafc76b3f2cf2feafe233
MD5 641ee6d6b249e7bbd01e3fe99f9c6576
BLAKE2b-256 8953ae57ee125618123f5eb932f8506a83bda3f1c5a27d60b88ef33d5c4719d5

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.3-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-2026.8.3-cp310-abi3-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl.

File metadata

File hashes

Hashes for real_regex-2026.8.3-cp310-abi3-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl
Algorithm Hash digest
SHA256 7f2a9ccb477fdb095fcc1825f2dda48cd5e4706ead08390b984fac1113021a9d
MD5 1b91df69d3f5cc08c12d0abc7637bf21
BLAKE2b-256 57113c04a19341a715c106ba2f267997b3b70899837a36ac18d08ebde7677432

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.3-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-2026.8.3-cp310-abi3-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl.

File metadata

File hashes

Hashes for real_regex-2026.8.3-cp310-abi3-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl
Algorithm Hash digest
SHA256 a3e6446516bec9731ef7d57a2f9cfc7d522ad9cde2cc78436e6a0bb89a430ca4
MD5 401bd1bec66cb4b7235e6a241a3dabdd
BLAKE2b-256 3406e3e61c105776f357f7ea0738f98be14dd67485451b47f21cb10006ceff58

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.3-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-2026.8.3-cp310-abi3-macosx_11_0_arm64.whl.

File metadata

File hashes

Hashes for real_regex-2026.8.3-cp310-abi3-macosx_11_0_arm64.whl
Algorithm Hash digest
SHA256 27dae4e0c615a4bec80dcd8774fb8fa454560b1a42c38c07541833d2fcf04f52
MD5 15e7e351419d67c80e08d7e3acd9efa7
BLAKE2b-256 9ff766052fd6f1bbaab33eb34a50218a3a8360e7a727484d079c95921bc2d446

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.3-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-2026.8.3-cp310-abi3-macosx_10_9_x86_64.whl.

File metadata

File hashes

Hashes for real_regex-2026.8.3-cp310-abi3-macosx_10_9_x86_64.whl
Algorithm Hash digest
SHA256 2b973ec8f42dcf5fb30cb1cc3d50393d7adafef56210eae74c9a526e5f0e8548
MD5 0e33f3de8071f96cb3e3bbae3280f8ee
BLAKE2b-256 d9d8d3017281b82363e5eb233325c0919eeda2db8a22990762059cf4306290b4

See more details on using hashes here.

Provenance

The following attestation bundles were made for real_regex-2026.8.3-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

2026.8.11

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

This release

2026.8.3 This release

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