utf8proc is a free/open-source (MIT/expat licensed) C library providing Unicode normalization, case-folding, and other operations for strings in the UTF-8 encoding, supporting up-to-date Unicode versions. See the utf8proc home page (http://julialang.org/utf8proc/) for downloads and other information, or the source code on github (https://github.com/JuliaLang/utf8proc).

For the utf8proc API documentation, see: utf8proc.h

The features of utf8proc include:

Transformation of strings (utf8proc_map()) to:
- decompose (UTF8PROC_DECOMPOSE) or compose (UTF8PROC_COMPOSE) Unicode combining characters (http://en.wikipedia.org/wiki/Combining_character)
- canonicalize Unicode compatibility characters (UTF8PROC_COMPAT)
- strip "ignorable" (UTF8PROC_IGNORE) characters, control characters (UTF8PROC_STRIPCC), or combining characters such as accents (UTF8PROC_STRIPMARK)
- case-folding (UTF8PROC_CASEFOLD)
Unicode normalization: utf8proc_NFD(), utf8proc_NFC(), utf8proc_NFKD(), utf8proc_NFKC()
Detecting grapheme boundaries (utf8proc_grapheme_break() and UTF8PROC_CHARBOUND)
Character-width computation: utf8proc_charwidth()
Classification of characters by Unicode category: utf8proc_category() and utf8proc_category_string()
Encode (utf8proc_encode_char()) and decode (utf8proc_iterate()) Unicode codepoints to/from UTF-8.