[ruby-core:68280] [Ruby trunk - Bug #10891] /[[:punct:]]/ POSIX group broken (with string literals?)

Issue #10891 has been updated by Tom Lord.


On further investigation, this is a known issue in Onigmo (Ruby 2.x's regexp parser).

However, it was apparently "fixed" way back in 2006: https://github.com/k-takata/Onigmo/blob/d0b3173893b9499a4e53ae1da16ba76c06d85571/HISTORY#L584-585 (Note: I can't find a reference to any Oniguruma/Onigmo source control dating back this far, to see the actual commit)

...And yet, it remains an open issue: https://github.com/k-takata/Onigmo/issues/42

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Bug #10891: /[[:punct:]]/ POSIX group broken (with string literals?)
https://bugs.ruby-lang.org/issues/10891#change-51638

* Author: Tom Lord
* Status: Open
* Priority: Normal
* Assignee: ruby-core
* 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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