Crate icu_locid

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Parsing, manipulating, and serializing Unicode Language and Locale Identifiers.

This module is published as its own crate (icu_locid) and as part of the icu crate. See the latter for more details on the ICU4X project.

The module provides algorithms for parsing a string into a well-formed language or locale identifier as defined by UTS #35: Unicode LDML 3. Unicode Language and Locale Identifiers.

Locale is the most common structure to use for storing information about a language, script, region, variants and extensions. In almost all cases, this struct should be used as the base unit for all locale management operations.

LanguageIdentifier is a strict subset of Locale which can be useful in a narrow range of cases where Unicode Extensions are not relevant.

If in doubt, use Locale.


use icu::locid::Locale;
use icu::locid::{
    subtags::{language, region},

let mut loc: Locale = locale!("en-US");

assert_eq!(, language!("en"));
assert_eq!(, None);
assert_eq!(, Some(region!("US")));
assert_eq!(, 0); = Some(region!("GB"));

assert_eq!(loc, locale!("en-GB"));

For more details, see Locale and LanguageIdentifier.