From: "znz (Kazuhiro NISHIYAMA) via ruby-core" <ruby-core@...>
Date: 2023-01-27T00:44:14+00:00
Subject: [ruby-core:112067] [Ruby master Bug#19379] Regex: "end pattern with unmatched parenthesis" with Ruby 3.2 and interpolation

Issue #19379 has been updated by znz (Kazuhiro NISHIYAMA).


```
% docker run --platform linux/amd64 --rm -it ghcr.io/ruby/all-ruby env ALL_RUBY_SINCE=ruby-3.0 ./all-ruby -e 'r=/#/;p /#{r}/x'   
ruby-3.0.0          /(?-mix:#)/x
...
ruby-3.2.0-preview1 /(?-mix:#)/x
ruby-3.2.0-preview2 -e:1:in `<main>': end pattern with unmatched parenthesis: /(?-mix:#)/x (RegexpError)
                exit 1
...
ruby-3.2.0          -e:1:in `<main>': end pattern with unmatched parenthesis: /(?-mix:#)/x (RegexpError)
                exit 1
```

----------------------------------------
Bug #19379: Regex: "end pattern with unmatched parenthesis" with Ruby 3.2 and interpolation
https://bugs.ruby-lang.org/issues/19379#change-101501

* Author: renchap (Renaud Chaput)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.2.0 (2022-12-25 revision a528908271) [arm64-darwin22]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
Sample code:

```
r2 = %r{#c-\w+/comment/[\w-]+}
%r{https?://[^/]+#{r2}}x
```

This works with Ruby 3.1:

```
irb(main):001:0> r2 = %r{#c-\w+/comment/[\w-]+}
irb(main):002:0> %r{https?://[^/]+#{r2}}x
=> /https?:\/\/[^\/]+(?-mix:#c-\w+\/comment\/[\w-]+)/x
```

But fails with Ruby 3.2.0:
```
irb(main):022:0> r2 = %r{#c-\w+/comment/[\w-]+}
irb(main):023:0> %r{https?://[^/]+#{r2}}x
(irb):23:in `<main>': end pattern with unmatched parenthesis: /https?:\/\/[^\/]+(?-mix:#c-\w+\/comment\/[\w-]+)/x (RegexpError)
```

But if I dont use interpolation, it works correctly:

```
irb(main):001:0> %r{https?://[^/]+#c-\w+/comment/[\w-]+}x
=> /https?:\/\/[^\/]+#c-\w+\/comment\/[\w-]+/x
```



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