From: usa@...
Date: 2016-03-25T09:41:57+00:00
Subject: [ruby-core:74568] [Ruby trunk Bug#12204] Invalid range of capital letters at Greek alphabet

Issue #12204 has been updated by Usaku NAKAMURA.

Backport changed from 2.1: REQUIRED, 2.2: REQUIRED, 2.3: REQUIRED to 2.1: DONE, 2.2: REQUIRED, 2.3: REQUIRED

ruby_2_1 r54284 merged revision(s) 54210.

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Bug #12204: Invalid range of capital letters at Greek alphabet
https://bugs.ruby-lang.org/issues/12204#change-57695

* Author: George Vrettos
* Status: Closed
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]
* Backport: 2.1: DONE, 2.2: REQUIRED, 2.3: REQUIRED
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Greek alphabet's first and last letter is:
* �� - �� (lower case)
* �� - �� (upper case)

So if we write on a ruby console the following script, we get:

~~~
('��'..'��').to_a

=> ["��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��"] 
~~~

**which is correct**, we get all **24  lower case characters** of the greek alphabet, and a "special one", the letter "��" which HAS NO EQUIVALENT uppercase letter. TOTAL: 25 characters 

Now if we try to run the above script with upper case characters...

~~~
('��'..'��').to_a

=> ["��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��"]
~~~
**we only get 17 characters**. The rest 7 upper case characters are missing! Those are (["��", "��", "��", "��", "��", "��", "��"])


Now if we try to "construct" the greek alphabet by using the UTF-8 equivalent number of its chatacter, we get the following:

~~~
(913..937).map { |char| char.chr('UTF-8') }

=> ["��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "��", "\u03A2", "��", "��", "��", "��", "��", "��", "��"]
~~~

Note the invalid character **"\u03A2"** between letters "��" and "��". 

I believe that the problem is the letter "��" (greek sigma) which **has no upper case equivalent**. Ruby throws an exception at this point and never returns the rest of the characters.
  

[[http://www.fileformat.info/info/unicode/char/03a2/index.htm]]



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