From: "zw963 (Wei Zheng)" <noreply@...>
Date: 2021-11-05T15:12:55+00:00
Subject: [ruby-core:105947] [Ruby master Bug#18291] When use =~ with named group, if regex is on the right side, variable not defined.

Issue #18291 has been reported by zw963 (Wei Zheng).

----------------------------------------
Bug #18291: When use =~ with named group, if regex is on the right side, variable not defined.
https://bugs.ruby-lang.org/issues/18291

* Author: zw963 (Wei Zheng)
* Status: Open
* Priority: Normal
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
Following code not work.


```rb
if "Billy Zheng" =~ /(?<first_name>\w+)\s+(?<last_name>\w+)/
  p first_name
  p last_name
end
# NameError: undefined local variable or method `first_name' for main:Object
```

But, if we switch left and right between =~

```rb
if /(?<first_name>\w+)\s+(?<last_name>\w+)/ =~ "Billy Zheng"
  p first_name
  p last_name
end
# => "Billy"
# =>"Zheng"
```

I know ruby keep this same behavior since 1.9, but i am curious if we can improve this?

I consider this as a bug, because that not good, when i want to use this way, i have to
take care must write regexp before =~

Thank you.







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