[ruby-core:112135] [Ruby master Bug#19379] Regex: "end pattern with unmatched parenthesis" with Ruby 3.2 and interpolation

Issue #19379 has been updated by naruse (Yui NARUSE).

Backport changed from 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONTNEED, 3.2: REQUIRED to 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONTNEED, 3.2: DONE

ruby_3_2 ca75332f46c39804e06cd37c2608cbdef0aebf05 merged revision(s) eccfc978fd6f65332eb70c9a46fbb4d5110bbe0a.

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Bug #19379: Regex: "end pattern with unmatched parenthesis" with Ruby 3.2 and interpolation
https://bugs.ruby-lang.org/issues/19379#change-101572

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