Bug #11859
Updated by matsui (Kimihito Matsui) almost 9 years ago
U+FF21 (Ａ, FULLWIDTH LATIN CAPITAL LETTER A) and U+00c0 (À, LATIN CAPITAL LETTER A WITH GRAVE) is `Uppercase_Letter` so it should be match and return 0 in following case but this returns 1.
~~~
ruby -e 'puts "\uFF21A".encode("EUC-JP") =~ Regexp.compile("\\\p{Upper}".encode("EUC-JP”))' # => 1
ruby -e 'puts "\u00C0A".encode("EUC-JP") =~ Regexp.compile("\\\p{Upper}".encode("EUC-JP"))’ # => 1
~~~
This also happens in lower case matching.
~~~
ruby -e 'puts "\uFF41a".encode("EUC-JP") =~ Regexp.compile("\\\p{Lower}".encode("EUC-JP"))’ ＃=> 1
~~~
In Unicode encoding it works as follows.
~~~
ruby -e 'puts "\uFF21A" =~ Regexp.compile("\\\p{Upper}")' # => 0
~~~
Looks like EUC-JP `\p{Upper}` and `\p{Lower}` regex is limited to ASCII characters.