[ruby-core:87278] [Ruby trunk Bug#14791] String.sub wrong parsing of replacement with capturing group

Issue #14791 has been reported by churib (Timo Grodzinski).

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Bug #14791: String.sub wrong parsing of replacement with capturing group
https://bugs.ruby-lang.org/issues/14791

* Author: churib (Timo Grodzinski)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.3.3p222 (2016-11-21) [x86_64-linux-gnu]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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~~~ ruby
irb(main):001:0> "abc".sub(/(b)/, '#\1#') # works
=> "a#b#c"
irb(main):002:0> "abc".sub(/(b)/, '\\1') # doesn't works, should be "a\bc"
=> "abc"
irb(main):003:0> "abc".sub(/(b)/, '\\\1') # doesn't works, should be "a\\bc"
=> "a\\1c"
irb(main):004:0> "abc".sub(/(b)/, "\\1") # works
=> "abc"
irb(main):005:0> "abc".sub(/(b)/, "\\\\1") # doesn't works, should be "a\bc"
=> "a\\1c"
irb(main):006:0> "abc".sub(/(b)/, '\ \1') # works
=> "a\ bc"
~~~




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