[ruby-core:114031] [Ruby master Bug#19746] `String#index` with regexp and too large offset doesn't clear `$~`

28 Jun 2023

      Issue #19746 has been reported by nobu (Nobuyoshi Nakada).

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Bug #19746: `String#index` with regexp and too large offset doesn't clear `$~`
https://bugs.ruby-lang.org/issues/19746

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Priority: Normal
* Backport: 3.0: REQUIRED, 3.1: REQUIRED, 3.2: REQUIRED
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```ruby
/./ =~ "a"
p "x".index(/0/, 4) #=> nil
p $~ #=> #<MatchData "a">
```

while `rindex` does.

```ruby
/./ =~ "a"
p "x".rindex(/0/, 4) #=> nil
p $~ #=> nil
```

It seems since 1.9.

-- 
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