Bug #18802: Negation of POSIX character class does not work

• Status: Rejected
• Assignee: -
• Target version: -
• ruby -v: 3.1.2
• Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN

[cohei (昂平 谷口)]

https://docs.ruby-lang.org/ja/3.1/doc/spec=2fregexp.html#charclass_posix
また、[:^クラス名:]という記法でその否定を意味します。

For example, [:^ascii:] is the negation of [:ascii:] according to the document. But it does not work:

irb(main):001:0> RUBY_VERSION
=> "3.1.2"
irb(main):002:0> %w[あああ あ a b :].map { _1.match?(/[:^ascii:]/) }
=> [false, false, true, false, true] # matches a, c, i, s, : or ^
irb(main):003:0> %w[あああ あ a b :].map { _1.match?(/[^[:ascii:]]/) }
=> [true, true, false, false, false] # expected

[mame (Yusuke Endoh)]

• Status changed from Open to Rejected

Note that the sentence is written in the section of character class. So [:^ascii:] must be used in a character class as follows:

irb(main):001:0> %w[あああ あ a b :].map { _1.match?(/[[:^ascii:]]/) }
=> [true, true, false, false, false]

If you want to improve the Japanese document, please contact on https://github.com/rurema/doctree/issues .

[cohei (昂平 谷口)]

Thank you! I misunderstood about character classes.