Issue #12636 has been reported by Mike McFadden.
----------------------------------------
Bug #12636: string.gsub(/([a-z](?=[A-Z._ ]))/, "#{$1} ") returns wrong result (possible C-string leak?)
https://bugs.ruby-lang.org/issues/12636
* Author: Mike McFadden
* Status: Open
* Priority: Normal
* Assignee:
* ruby -v: ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin15]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
Verified in Ruby 2.1, 2.2, and 2.3.
> "Hello.World".gsub(/([a-z](?=[A-Z._ ]))/, "#{$1} ")
=> "Hell .World"
^ wrong answer; it should be `"Hello .World"`
> "Hello.World".gsub(/([a-z](?=[A-Z._ ]))/, "#{$1} ")
=> "Hello .World"
^ running it a second time in the same IRB session now returns the correct result, however...
> "Help.World".gsub(/([a-z](?=[A-Z._ ]))/, "#{$1} ")
=> "Helo .World"
^ now the p turned into an o somehow? It's clearly retaining strings from the previous invocation and reusing them, but not updating every byte.
Here's the equivalent code in JavaScript, which returns the correct result every time:
"Hello.World".replace(/([a-z](?=[A-Z._ ]))/g, "$1 ")
--
https://bugs.ruby-lang.org/
Unsubscribe: <mailto:ruby-core-request / ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>