[ruby-core:97939] [Ruby master Feature#16796] Assigning local variables when using `case when regexp`

[sawadatsuyoshi@gmail.com]

Issue #16796 has been updated by sawa (Tsuyoshi Sawada).


I have met such use cases, and agree this would be useful.

Alternatively, in order to access even unnamed matches, assigning the last matched data to a variable with the following syntax may be useful.

```ruby
case "str"
when /s(?<mid>.)r/ => match_data
  match_data[:mid] # => "t"
end
```

```ruby
case "str"
when /s(.)r/ => match_data
  match_data[1] # => "t"
end
```


----------------------------------------
Feature #16796: Assigning local variables when using `case when regexp`
https://bugs.ruby-lang.org/issues/16796#change-85162

* Author: UlyssesZhan (有丘 詹)
* Status: Open
* Priority: Normal
----------------------------------------
I want to use
```ruby
case "str"
when /s(?<mid>.)r/
  p mid
end
```
instead of
```ruby
case
when /s(?<mid>.)r/ =~ "str"
  p mid
end
```
I also do not like using `$1`.

This feature is extremely useful when there are a lot of `when`s.



-- 
https://bugs.ruby-lang.org/