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Add UN M.49 region containment support #193

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ptr727 merged 3 commits into from
Jun 26, 2026
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Add UN M.49 region containment support #193

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f230a41
Add UN M.49 region containment support
ptr727 Jun 26, 2026
e616b9d
Address Copilot review feedback
ptr727 Jun 26, 2026
998c01f
Reword ExpandRegion docs to avoid BCP 47 variant ambiguity
ptr727 Jun 26, 2026
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7 changes: 7 additions & 0 deletions HISTORY.md
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Expand Up @@ -4,6 +4,13 @@ C# .NET library for ISO 639-2, ISO 639-3, RFC 5646 / BCP 47 language tags.

## Release History

- Version 1.4:
- Added UN M.49 region containment support sourced from Unicode CLDR.
- Added `LanguageLookup.IsMatch(prefix, tag, regionContainment)` so a UN M.49 region group matches a contained region, e.g. `es-419` matches `es-MX`.
- Added `LanguageLookup.ExpandRegion()` to expand a region into its containing UN M.49 groups.
- Fixed parsing of a numeric region following the language, e.g. `es-419` now parses `419` as a region not an extended language.
- Version 1.3:
- Dependency, codegen, CI, and project template maintenance.
- Version 1.2:
- Refactored the project to follow standard patterns used across other projects.
- Added logging support configured through `LogOptions.SetFactory(ILoggerFactory)`.
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5,574 changes: 5,574 additions & 0 deletions LanguageData/unm49
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