Crate icu_casemapping

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🚧 [Experimental] Case mapping for Unicode characters and strings.

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

🚧 This code is experimental; it may change at any time, in breaking or non-breaking ways, including in SemVer minor releases. It can be enabled with the "experimental" Cargo feature of the icu meta-crate. Use with caution. #2535



  • Data provider struct definitions for this ICU4X component.


  • A struct with the ability to convert characters and strings to uppercase or lowercase, or fold them to a normalized form for case-insensitive comparison.
  • CaseMappingInternals provides low-level access to the data necessary to convert characters and strings to upper, lower, or title case.