.re
2 claimants
1 primary
1 secondary
unambiguous primary
SWH popularity
From the SWH-MSR-ARV dataset (Desmazières, Di Cosmo, Lorentz, MSR 2025; file nb_extensions_alphanum.csv) — one row per (ext, year) in the full SWH archive. Case-aggregated. citation.
545.7K
total occurrences
178.4K
since 2019 (32.7%)
1970–2023
years active
Case variants in archive: .re (545.3K), .Re (284), .RE (110) — aggregated above.
Attribution status
This extension is attributed to Reason; Reason; Reason as primary by 3 authoritative claims.
Claimants (4)
Languages that list
.re among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| Reason | linguist | primary |
| Reason | pygments | primary |
| Reason | wikidata | primary |
| C++ | linguist | secondary |
Wikidata says… (2)
File formats, image formats, audio codecs and other non-PL
entities that claim
.re on Wikidata
(property P1195) or in the Wikipedia infobox.
Source: data/derived/external_extension_index.csv.
Click Use as new PL on any row to open the
Add-PL form pre-filled with that entry's name, Wikipedia/Wikidata
URL, and this extension — one submission creates the PL + claim.
| Format | Class (Wikidata P31) | Suggested label | MIME | Notes | Action |
|---|---|---|---|---|---|
| Re:VIEW Q24885455 lightweight markup language | lightweight markup language | — | — | — | Use as new PL ↗ |
| ReasonML file format Q130602563 file format | file format | — | text/x-reasonml | — | Use as new PL ↗ |
Disambiguation rules (2)
Linguist heuristics that decide, by content, which language a
.re file actually is.| Rule | Predicts | Kind | Predicates (truncated) |
|---|---|---|---|
h/linguist/.re/0 | Reason | predicates | [{"kind": "any", "regexes": ["^\\s*module\\s+type\\s", "^\\s*(?:include|open)\\s+\\w+\\s*;\\s*$", "^\\s*let\\s+(?:module\\s\\w+\\s*=\\s*\\{|\\w+:\\s+.*=.*;\\s*$)"]}] |
h/linguist/.re/1 | C++ | predicates | [{"kind": "any", "regexes": ["^\\s*#(?:(?:if|ifdef|define|pragma)\\s+\\w|\\s*include\\s+<[^>]+>)", "^\\s*template\\s*<"]}] |
SWH-mined examples (0)
No archived examples for .re in our local mirror yet.