Re: Uppercase ß

[Hans Åberg via Unicode]

> On 29 May 2018, at 10:54, Martin J. Dürst <duerst at it.aoyama.ac.jp> wrote:
> 
> On 2018/05/29 17:15, Hans Åberg via Unicode wrote:
>>> On 29 May 2018, at 07:30, Asmus Freytag via Unicode <unicode at unicode.org> wrote:
> 
>>> An uppercase exists and it has formally been ruled as acceptable way to write this letter (mostly an issue for ALL CAPS as ß does not occur in word-initial position).
>>> A./
>> Duden used one in 1957, but stated in 1984 that there is no uppercase version [1]. So it would be interesting with a reference to an official version.
>> 1. https://en.wikipedia.org/wiki/ß
> 
> The English wikipedia may not be fully up to date.
> See https://de.wikipedia.org/wiki/Großes_ß (second paragraph):
> 
> "Seit dem 29. Juni 2017 ist das ẞ Bestandteil der amtlichen deutschen Rechtschreibung.[2][3]"
> 
> Translated to English: "Since June 29, 2017, the ẞ is part of the official German orthography."
> 
> (As far as I remember the discussion (on this list?) last year, the ẞ (uppercase ß) is allowed, but not required.)

And it is already in Unicode as ẞ LATIN CAPITAL LETTER SHARP S U+1E9E. When looking for the lowercase ß
LATIN SMALL LETTER SHARP S U+00DF in a MacOS Character Viewer, it does not give the uppercase version, for some reason.

The equivalence with "ss" shows up ICU Regular Expressions that do case insensitive matching where the cases have different length, so it should do that for the new character to, I gather.
  http://userguide.icu-project.org/strings/regexp