From: gregg@...
Date: 2014-12-29T02:35:24+00:00
Subject: [ruby-core:67193] [ruby-trunk - Bug #10670] [Open] char-class matching same character with different encodings raises exception

Issue #10670 has been reported by Gregg Kellogg.

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Bug #10670: char-class matching same character with different encodings raises exception
https://bugs.ruby-lang.org/issues/10670

* Author: Gregg Kellogg
* Status: Open
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
* ruby -v: ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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The following simple script illustrates the issue:

    ESCAPE_PLAIN = /\A[\x5B]*\z/m.freeze

    0x5B.chr(::Encoding::UTF_8) =~ ESCAPE_PLAIN
    0x5B.chr =~ ESCAPE_PLAIN

\x5B is ']', run all lines above and get _in `=~': empty char-class: /\A[\x5B]*\z/m (RegexpError)_

Comment out either the first or second usage and the error goes away.



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