Issue #12862 has been updated by Shyouhei Urabe.

Description updated

----------------------------------------
Bug #12862: Regular Expression Named Group Matching does not work with #{} (Similar? to issue #2778)
https://bugs.ruby-lang.org/issues/12862#change-61005

* Author: Leo Amigud
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-linux]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
Loading development environment (Rails 4.2.5)

```
irb(main):001:0> /\$(?<dollars>\d+)\.(?<cents>\d+)/ =~ "$3.67"
=> 0
irb(main):002:0> dollars
=> "3"
```

BUT:

```
irb(main):001:0> numbers = '\d+'
=> "\\d+"
irb(main):002:0> /\$(?<dollars>#{numbers})\.(?<cents>\d+)/ =~ "$3.67"
=> 0
irb(main):003:0> dollars
NameError: undefined local variable or method `dollars' for main:Object
```



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