[ruby-core:109027] [Ruby master Feature#18838] Avoid swallowing regexp escapes in the lexer

Issue #18838 has been updated by mame (Yusuke Endoh).


Agreed with Jeremy. There is the same "inconsistency" in a string literal, but this is clearly by design.

```
puts   'foo\'bar'  #=> foo'bar
puts %q'foo\'bar'  #=> foo'bar
puts %q{foo\'bar}  #=> foo\\'bar
```

----------------------------------------
Feature #18838: Avoid swallowing regexp escapes in the lexer
https://bugs.ruby-lang.org/issues/18838#change-98142

* Author: andrykonchin (Andrew Konchin)
* Status: Closed
* Priority: Normal
----------------------------------------
According to `Regexp#source` documentation:

```
Returns the original string of the pattern.
/ab+c/ix.source #=> "ab+c"

Note that escape sequences are retained as is.
/\x20\+/.source  #=> "\\x20\\+"
```

It works well but backslash (/) is processed in different way by different regexp literal forms.

Examples:

```ruby
/\//.source # => "/"
%r/\//.source # => "/"
%r{\/}.source # => "\\/"
```

Expected result - in all the cases result is the same.

Moreover as documentation states - `escape sequences are retained as is`. So I would say that only `%r{}` works properly.

The issue was reported here https://github.com/oracle/truffleruby/issues/2569.



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