From: kentkt@...
Date: 2014-09-11T13:34:52+00:00
Subject: [ruby-core:64963] [ruby-trunk - Bug #9728] Regexp bug

Issue #9728 has been updated by Ken Takata.


This bug is fixed with the following Onigmo's commit:
https://github.com/k-takata/Onigmo/commit/15ddec6d18e27fdc1988236764e766fd5892ecf5
This fix is included in Onigmo 5.15.0.

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Bug #9728: Regexp bug
https://bugs.ruby-lang.org/issues/9728#change-48847

* Author: Tsuyoshi Sawada
* Status: Open
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
* ruby -v: Ruby 2.0
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
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As reported in StackOverflow (http://stackoverflow.com/questions/23004527) (with a wrong expectation), the following regex pattern with the `*` operator does not match.

    "ab" =~ /(?!^a).*b/
    # => nil

When `?` is used instead, it seems to match correctly:

    "ab" =~ /(?!^a).?b/
    # => 1

According to the original reporter of the linked site, this does not happen in Ruby 1.9.3.



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