[ruby-core:97946] [Ruby master Feature#16796] Assigning local variables when using `case when regexp`

Issue #16796 has been updated by shevegen (Robert A. Heiler).


sawa wrote:

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

I don't disagree in the sense that there may be valid use cases,
but the syntax is kind of weird:

    /s(?<mid>.)r/

I use regexes a lot of course, since they are useful. But do we
really gain a lot from making what used to be simple, harder?

I understand that you may avoid an extra step (assignment, after
the regex match), but to me personally I find that style so 
much harder to read, compared to:

    if /(foo.+)/
      mid = $1.to_s.dup # or something like that
    end

Admittedly I am very much a very oldschool-ruby person. ;)

By the way, while I personally do not really like $ variables,
I actually use them a LOT, whereas I rarely use match_data[]
syntax style. Dunno why, perhaps a habit, but the $1 $2 etc..
are ony of the few (semi) global variables that I like.
(I write "semi" because they tend to be more volatile, which
is why I may tend to use .dup like a semi-crazy person a
lot, rather than fix a regex or handle nils - I .to_s.dup 
all the things! ;) )

----------------------------------------
Feature #16796: Assigning local variables when using `case when regexp`
https://bugs.ruby-lang.org/issues/16796#change-85168

* 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.



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