# Oniguruma vs RE2

| Attribute | Oniguruma | RE2 |
|---|---|---|
| **Vioscale score** | 57.6 (19% (low)) | 48.8 (26% (low)) |
| activity.commits_last_30d | 0 | 0 |
| adoption.github_stars | 2,523 | 9,785 |
| deployment.options | `{"self_hosted":true}` | `{"self_hosted":true}` |
| description.long | Open-source regular expression library offering POSIX, GNU regex, and extended APIs with support for various character encodings. Available as a library for inclusion in programs on Linux, Unix, Cygwin, and Windows platforms. | RE2 is a C++ library providing a thread-safe alternative to traditional backtracking regex engines like PCRE and Perl, prioritizing predictable performance and security over feature completeness. |
| integrations.count | - | 1 |
| integrations.list | - | `[{"name":"GitHub"}]` |
| language.primary | C | C++ |
| license.spdx | - | BSD-3-Clause |
| market.availability | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"hqCountry":"US","primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"linux":true,"windows":true}` | `{"cli":true,"mac":true,"linux":true,"windows":true}` |
| pricing | `{"type":"open_source","freeTier":true,"sourceUrl":"https://github.com/pricing","retrievedAt":"2026-08-19T21:10:07.180Z"}` | `{"type":"open_source","summary":"Open source, free","freeTier":true,"sourceUrl":"https://github.com/pricing","retrievedAt":"2026-08-19T21:07:02.645Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | commercial | commercial |
| pricing.price_level | free | free |
| pricing.transparent | yes | yes |
| release.cadence_days | 9 | 30 |
| release.history | `[{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.10","date":"2025-01-01T01:48:04Z","type":"stable","version":"v6.9.10"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.9","date":"2023-10-14T12:02:28Z","type":"stable","version":"v6.9.9"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.8","date":"2022-04-29T04:51:40Z","type":"stable","version":"v6.9.8"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.7.1","date":"2021-04-15T08:31:52Z","type":"stable","version":"v6.9.7.1"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.7","date":"2021-04-14T07:31:53Z","type":"stable","version":"v6.9.7"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.7_rc1","date":"2021-03-31T01:39:52Z","type":"prerelease","version":"v6.9.7_rc1"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.6","date":"2020-11-05T01:08:23Z","type":"stable","version":"v6.9.6"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.6_rc4","date":"2020-10-21T08:33:58Z","type":"prerelease","version":"v6.9.6_rc4"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.6_rc3","date":"2020-10-16T11:48:57Z","type":"prerelease","version":"v6.9.6_rc3"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.6_rc2","date":"2020-10-09T09:31:33Z","type":"prerelease","version":"v6.9.6_rc2"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.6_rc1","date":"2020-10-07T03:02:26Z","type":"prerelease","version":"v6.9.6_rc1"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.5_rev1","date":"2020-04-26T07:38:34Z","type":"stable","version":"v6.9.5_rev1"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.5","date":"2020-04-20T09:09:20Z","type":"stable","version":"v6.9.5"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.5_rc2","date":"2020-04-12T09:29:50Z","type":"prerelease","version":"v6.9.5_rc2"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.5_rc1","date":"2020-04-04T14:20:28Z","type":"prerelease","version":"v6.9.5_rc1"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.4","date":"2019-11-29T04:38:34Z","type":"stable","version":"v6.9.4"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.4_rc3","date":"2019-11-22T04:26:02Z","type":"prerelease","version":"v6.9.4_rc3"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.4_rc2","date":"2019-11-14T05:38:53Z","type":"prerelease","version":"v6.9.4_rc2"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.4_rc1","date":"2019-11-05T05:30:21Z","type":"prerelease","version":"v6.9.4_rc1"},{"url":"https://github.com/kkos/oniguruma/releases/tag/v6.9.3","date":"2019-08-06T00:04:02Z","type":"stable","version":"v6.9.3"}]` | `[{"url":"https://github.com/google/re2/releases/tag/2025-11-05","date":"2025-11-05T14:47:56Z","type":"stable","version":"2025-11-05"},{"url":"https://github.com/google/re2/releases/tag/2025-08-12","date":"2025-08-12T21:55:43Z","type":"stable","version":"2025-08-12"},{"url":"https://github.com/google/re2/releases/tag/2025-08-05","date":"2025-08-05T19:17:59Z","type":"stable","version":"2025-08-05"},{"url":"https://github.com/google/re2/releases/tag/2025-07-22","date":"2025-07-22T15:33:14Z","type":"stable","version":"2025-07-22"},{"url":"https://github.com/google/re2/releases/tag/2025-07-17","date":"2025-07-17T21:38:46Z","type":"stable","version":"2025-07-17"},{"url":"https://github.com/google/re2/releases/tag/2024-07-02","date":"2024-07-01T14:01:30Z","type":"stable","version":"2024-07-02"},{"url":"https://github.com/google/re2/releases/tag/2024-07-01","date":"2024-06-30T14:08:55Z","type":"stable","version":"2024-07-01"},{"url":"https://github.com/google/re2/releases/tag/2024-06-01","date":"2024-05-31T14:06:16Z","type":"stable","version":"2024-06-01"},{"url":"https://github.com/google/re2/releases/tag/2024-05-01","date":"2024-04-30T14:20:08Z","type":"stable","version":"2024-05-01"},{"url":"https://github.com/google/re2/releases/tag/2024-04-01","date":"2024-03-31T13:09:37Z","type":"stable","version":"2024-04-01"},{"url":"https://github.com/google/re2/releases/tag/2024-03-01","date":"2024-02-29T13:08:49Z","type":"stable","version":"2024-03-01"},{"url":"https://github.com/google/re2/releases/tag/2024-02-01","date":"2024-01-31T13:10:12Z","type":"stable","version":"2024-02-01"},{"url":"https://github.com/google/re2/releases/tag/2023-11-01","date":"2023-10-31T15:21:01Z","type":"stable","version":"2023-11-01"},{"url":"https://github.com/google/re2/releases/tag/2023-09-01","date":"2023-08-31T14:44:43Z","type":"stable","version":"2023-09-01"},{"url":"https://github.com/google/re2/releases/tag/2023-08-01","date":"2023-07-31T14:42:03Z","type":"stable","version":"2023-08-01"},{"url":"https://github.com/google/re2/releases/tag/2023-07-01","date":"2023-06-30T17:59:47Z","type":"stable","version":"2023-07-01"},{"url":"https://github.com/google/re2/releases/tag/2023-06-02","date":"2023-06-01T14:08:47Z","type":"stable","version":"2023-06-02"},{"url":"https://github.com/google/re2/releases/tag/2023-06-01","date":"2023-05-31T15:26:12Z","type":"stable","version":"2023-06-01"},{"url":"https://github.com/google/re2/releases/tag/2023-03-01","date":"2023-03-01T07:36:46Z","type":"stable","version":"2023-03-01"},{"url":"https://github.com/google/re2/releases/tag/2023-02-01","date":"2023-02-01T07:45:12Z","type":"stable","version":"2023-02-01"}]` |
| security.disclosure_policy | - | yes |
| security.scorecard | 3.9 | 6.3 |
| security.vulnerabilities | - | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=google-re2&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (Regex Tools)

| Capability | Oniguruma | RE2 |
|---|:--:|:--:|
| **Capabilities** |  |  |
| Redos resistant | - | - |
| Lookaround support | - | - |
| Backreferences | - | - |
| Unicode property escapes | - | - |
| Named captures | - | - |
| Multi pattern matching | - | - |
| Interface type | - | - |
| Visualization | - | - |
| Code generation | - | - |

*Source: Vioscale. Generated 2026-09-01T15:00:14.008Z. "-" = undocumented, not absent.*