# Reference implementations and sources

Inspection date: 2026-07-27.

| Reference                | Exact revision/version                                                                                                  | Licence                                | Use and copying status                                                                              |
| ------------------------ | ----------------------------------------------------------------------------------------------------------------------- | -------------------------------------- | --------------------------------------------------------------------------------------------------- |
| Regex Tools              | Release identity `v0.3.0`                                                                                               | GPL-3.0-or-later                       | Application source written for this project.                                                        |
| Toolbox SDK              | `53c40a61ba1581246f65773fcbb1c1cfd31ac98e` / 0.2.2                                                                      | Apache-2.0                             | Contract, shell and release conventions; package APIs used, no source adapted.                      |
| Toolbox Portal           | `a9c31c8986c40a0097966318e925083302e91e13` / 0.5.0                                                                      | AGPL-3.0-only                          | Assembly/lock conventions inspected; no source copied into the app.                                 |
| regexpp                  | 4.12.2; npm integrity `sha512-EriSTlt5OC9/7SXkRSCAhfSxxoSUgBm33OH+IkwbdpgoqsSsUg7y3uh+IICI/Qg4BBWr3U2i39RpmycbxMq4ew==` | MIT                                    | Pinned ECMAScript syntax provider. Provider AST is normalized in a worker.                          |
| PCRE2                    | signed tag 10.47; commit `f454e231fe5006dd7ff8f4693fd2b8eb94333429`                                                     | BSD-3-Clause WITH PCRE2-exception      | Pinned offline build; generated verified WebAssembly pack is shipped, source is not vendored.       |
| Pyodide                  | tag 314.0.3; commit `ac57031be7564f864d061cb37c5c152e59f83ad4`; pinned npm integrity                                    | MPL-2.0                                | Reviewed self-hosted runtime pack; no CDN use.                                                      |
| CPython                  | executable runtime identity 3.14.2 in Pyodide 314.0.3                                                                   | PSF-2.0                                | Actual `re` compiler, matcher and replacement runtime; Python source is not vendored.               |
| TeaVM                    | tag/commit `ee91b03e616c4b45401cd11fb0cd7eb0daf6649b` / 0.15.0                                                          | Apache-2.0                             | `java.util.regex` class library compiled into the verified module; not OpenJDK.                     |
| ECMAScript specification | <https://tc39.es/ecma262/>; living specification inspected 2026-07-24                                                   | ECMA terms                             | Semantics reference; no prose copied.                                                               |
| regex101                 | <https://regex101.com/> and public parser documentation                                                                 | Product/commercial terms               | Product reference only. No source, branding, explanations, reference prose or visual design copied. |
| `recheck`                | 4.5.0                                                                                                                   | MIT                                    | Metadata inspected; not installed or shipped.                                                       |
| `regexp-ast-analysis`    | 0.7.1                                                                                                                   | MIT                                    | Metadata inspected; not installed or shipped.                                                       |
| RegexHub                 | repository revision `d1d9f19d259745dfdd21935b9ef3e747b62b9bfb`                                                          | MIT                                    | Potential future adversarial cases; no file copied.                                                 |
| RegexLib                 | Website inspected                                                                                                       | Redistribution licence not established | No fixture copied.                                                                                  |
| RGXP.RU                  | Website inspected                                                                                                       | Redistribution licence not established | No fixture copied.                                                                                  |

All v0.1.0, v0.2.0 and v0.3.0 conformance cases are project-authored. See
`tests/fixtures/README.md`.
