.lex

1 claimant 0 primary 1 secondary secondary-only

SWH popularity

Distinct files in the full Software Heritage archive (2026-06-04 export), dated by first appearance, following Desmazières, Di Cosmo, Lorentz (MSR 2025). Case-aggregated. citation.

104.6K
total files
22.2K
first seen 2021–2025 (21.3%)
2017
median year (half its files since)

Case variants in archive: .lex (104.2K), .LEX (348), .Lex (43), .LeX (2), .lEx (1) — aggregated above.

Attribution status

This extension is attributed to Lex — every claim across all sources (including secondary ones) points to a single language.

Authoritative sources: △ Linguist · secondary ✗ Pygments · no claim ✗ Wikidata · no claim ✗ Wikipedia · no claim

Disagree or have a correction? Open a labelling issue.

Claimants (1)

Languages that list .lex among their extensions. Strength reflects whether the upstream source treated it as their primary extension.
LanguageSourceStrength
Lexlinguistsecondary

Wikidata says… (2)

File formats, image formats, audio codecs and other non-PL entities that claim .lex 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.
Right entry isn't listed? Add manually ↗
FormatClass (Wikidata P31)Suggested labelMIMENotesAction
Polar SpellChecker dictionary Q105861112
file format
file format—application/octet-stream—Use as new PL ↗
Proximity Technology Lexicon/Thesaurus Q105865669
file format
file format—application/octet-stream—Use as new PL ↗

SWH-mined examples (1)

Real archived programs with this extension, byte-verified against the SWH archive, grouped by predicted language and by how the prediction was made. Useful for deciding what this extension actually is when the attribution is uncertain.
Lex (1) — 1 via fallback
lex-en.lex · 265 B · seen 15× in SWH
predicted: Lex via fallback
swh:1:cnt:eeb8535c186e82ef4c1bbd5148f84bfbd5a4cfac;origin=https://github.com/qingtianxt/IQAA-Maven;anchor=swh:1:rev:c1a8a6c072223d4e8f58c4a477f74c68e3696b29;path=/config.lexicon/lex-en.lex
Open in SWH · Raw bytes
Request more SWH-mined examples
If the examples above don't disambiguate what .lex is, request a fresh mining run.
(or open the pre-filled issue directly)