How do I convert binary UTF-8 string to string?

Question

Is it possible to convert Erlang binary UTF-8 string (like <<"HELLO">>) to lowercase without converting it to list and back?

This library: github.com/erlang-unicode/ux.

Nycholas Oliveira Oliveira
– Nycholas Oliveira Oliveira

2012-09-08 19:30:58 +00:00
Commented Sep 8, 2012 at 19:30 — Nycholas Oliveira Oliveira
– Nycholas Oliveira Oliveira, Commented Sep 8, 2012 at 19:30

Victor Moroz · Accepted Answer · 2011-05-24 19:33:09Z

12

If you know how to lowercase unicode character and key words here are "without converting it to list and back", then the answer could be:

<< <<(unicode_to_lower(C))/utf8>> || <<C/utf8>> <= <<"HELLO">> >>.

answered May 24, 2011 at 19:33

Victor Moroz

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4 Comments

Adam Lindberg Over a year ago

@Kay: Having a working implementation of unicode_to_lower/1 is implied by the answer.

Ivan Dubrov Over a year ago

I knew I am missing something really simple! Thanks!

Boris Mühmer Over a year ago

Note: This will only work on a very small subset (the ASCII range)! For some "values" You have to peek at the following bytes (I think up to 6 bytes). en.wikipedia.org/wiki/UTF-8

Victor Moroz Over a year ago

@bsmr It will work not just for ASCII 1> [ C || <<C/utf8>> <= unicode:characters_to_binary("ПРИВЕТ") ]. [1055,1056,1048,1042,1045,1058]

Facundo Olano · Accepted Answer · 2017-08-17 16:22:13Z

11

string:lowercase in Erlang 20 works with binaries:

1> string:lowercase(<<"HELLO">>).
<<"hello">>

edited Aug 17, 2017 at 16:22

answered Aug 17, 2017 at 15:12

Facundo Olano

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