Issue #11793 has been updated by Nobuyoshi Nakada.

Description updated

The document states "It may contain back-references", `\+` is one of them.

Note: preformated text requires a preceding blank line.

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Bug #11793: puts 'ab'.gsub('a', '\\+') - unexpected output
https://bugs.ruby-lang.org/issues/11793#change-55396

* Author: William Burnson
* Status: Rejected
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-darwin15]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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Test case:

~~~ruby
puts 'ab'.gsub('a', '\\+')
~~~

Expected output:

~~~
\+b
~~~

Actual output:

~~~
b
~~~

The way I understand `gsub(pattern, replacement)` when used with two string arguments is that it will perform a literal replacement, so it is quite unexpected that substituting with `\+` removes the pattern entirely.

Doc: http://ruby-doc.org/core-2.2.3/String.html#method-i-gsub



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