Locale constructor

A representation of a locale, consisting of a language code and optional country and variant codes.

Useful for internationalization (i18n) and localization (l10n), supporting language tags like "en", "en-US", or "fr-FR-Paris". The locale follows the pattern: language[-country[-variant]].

Usage

Create a locale with just a language:

final locale = Locale('en');
print(locale.getLanguageTag()); // Output: "en"

Create a locale with language and country:

final locale = Locale('en', 'US');
print(locale.getLanguageTag()); // Output: "en-US"

Create a locale with language, country, and variant:

final locale = Locale('fr', 'FR', 'Paris');
print(locale.getLanguageTag()); // Output: "fr-FR-Paris"

Parse a locale from a string:

final locale = Locale.parse('es-MX');
print(locale.getLanguage()); // Output: "es"
print(locale.getCountry()); // Output: "MX"

Validation

The class automatically validates and normalizes input:

• Language codes are converted to lowercase and must be 2-3 characters
• Country codes are converted to uppercase and must be exactly 2 characters
• Variants must contain only word characters and hyphens

Invalid inputs will throw InvalidFormatException.