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unistring
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Unicode utf-8 functions for Erlang
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unistring
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#unistring ========= ##Why Starting with Erlang **R16B**, [string module](http://www.erlang.org/doc/man/string.html) in standard library handles Unicode utf-8 strings very well, except that ```string:to_upper/1``` and ```string:to_lower/1``` ignore unicode code points > 255. Unistring library uses Lowercase Mapping, Uppercase Mapping and Titlecase Mapping columns hexadecimal values from [UnicodeData.txt](ftp://ftp.unicode.org/Public/UNIDATA/UnicodeData.txt). ##License Public Domain ##API Unicode utf-8 functions for Erlang: ```erlang unistring:to_lower/1 unistring:to_upper/1 unistring:to_title/1 ``` Input to functions can be in ```charlist()``` or ```unicode_binary()``` format. charlist() is a list of unicode code points, such as: ```[50504,45397,54616,49464,50836]``` means ```"안녕하세요"```. unicode_binary() is a binary string with utf8 encoding, such as: ```<<236,149,136,235,133,149,237,149,152,236,132,184,236,154,148>>``` means ```"안녕하세요"```. charlist() and unicode_binary() can be converted from one to another using the [unicode module](http://www.erlang.org/doc/man/unicode.html) in Erlang **R16B** or later. ##Examples Make sure to start your erl shell with ```erl +pc unicode``` Make sure to add ```%% -*- coding: utf-8 -*-``` to the beginning of your ```*.erl``` source code files if you will be using unicode characters inside of quotes. If you are creating unicode binary strings, make sure to append **/utf8** after the string's end quote mark inside of <<>> such as: ```<<"안녕하세요"/utf8>>. ```erlang %% unistring:to_lower/1 "test" = unistring:to_lower("TEST"). <<"test">> = unistring:to_lower(<<"TEST">>). "привет" = unistring:to_lower("ПРИВЕТ"). <<"привет"/utf8>> = unistring:to_lower(<<"ПРИВЕТ"/utf8>>). %% unistring:to_upper/1 "TEST" = unistring:to_upper("test"). <<"TEST">> = unistring:to_upper(<<"test">>). "ПРИВЕТ" = unistring:to_upper("привет"). <<"ПРИВЕТ"/utf8>> = unistring:to_upper(<<"привет"/utf8>>). ``` ##Note I don't really see the point of ```unistring:to_title/1``` but it is included in this library for completeness.
