Issue #10891 has been updated by Yui NARUSE.

Status changed from Open to Feedback

It follows UTR#18's Standard Recommendation.
http://www.unicode.org/reports/tr18/#punct

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Bug #10891: /[[:punct:]]/ POSIX group broken (with string literals?)
https://bugs.ruby-lang.org/issues/10891#change-55149

* Author: Tom Lord
* Status: Feedback
* Priority: Normal
* Assignee: Yui NARUSE
* ruby -v: ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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The regular expression: `/[[:punct:]]/` should match the following characters:

    ! " # $ % & ' ( ) * + , - . / : ; < = > ? @ [ \ ] ^ _ ` { | } ~

However, it only works for these characters:

    ! " # % & ' ( ) * , - . / : ; ? @ [ \\ ] _ { }

And does not work for these characters:

    $ + < = > ^ ` | ~

However, this is where it gets really weird... Consider the following:

    60.chr == "<" # true
    60.chr =~ /[[:punct:]]/ # => 0
    "<" =~ /[[:punct:]]/ # => nil

So, it seems that the regular expression only fails for string literals!



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