From: "sawa (Tsuyoshi Sawada)" <sawadatsuyoshi@...>
Date: 2013-04-06T09:58:50+09:00
Subject: [ruby-core:54046] [ruby-trunk - Bug #8210] Multibyte character interfering with end-line character within a regex


Issue #8210 has been updated by sawa (Tsuyoshi Sawada).


=begin
The problem seems to happen with combination of a certain token, `?`, and `\z`.

    "���������������" =~ /a?\z/ # => nil
    "���������������" =~ / ?\z/ # => nil
    "���������������" =~ /\t?\z/ # => nil
    "���������������" =~ /\n?\z/ # => nil
    "���������������" =~ /\s?\z/ # => nil
    "���������������" =~ /.?\z/ # => 4
    "���������������" =~ /\S?\z/ # => 4
    "���������������" =~ /\W?\z/ # => 5
    "���������������" =~ /���?\z/ # => 5
    "���������������" =~ /\w?\z/ # => 5
=end

----------------------------------------
Bug #8210: Multibyte character interfering with end-line character within a regex
https://bugs.ruby-lang.org/issues/8210#change-38278

Author: sawa (Tsuyoshi Sawada)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: 2.0


=begin
With this regex:

    regex1 = /\z/

the following strings match as expected:

    "hello" =~ regex1 # => 5
    "���������������" =~ regex1 # => 5

but with these regexes:

    regex2 = /#$/?\z/
    regex3 = /\n?\z/

they show difference:

    "hello" =~ regex2 # => 5
    "hello" =~ regex3 # => 5
    "���������������" =~ regex2 # => nil
    "���������������" =~ regex3 # => nil

The string encoding is UTF-8, and the OS is Linux (i.e., `$/` is `"\n"`). I expect them to behave the same, and believe this is a bug.
=end


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