[ruby-core:118867] [Ruby master Bug#20681] Regular expression warnings are treated as compiler warnings during runtime

Issue #20681 has been reported by Earlopain (A S).

----------------------------------------
Bug #20681: Regular expression warnings are treated as compiler warnings during runtime
https://bugs.ruby-lang.org/issues/20681

* Author: Earlopain (A S)
* Status: Open
* ruby -v: 3.3.4
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
I have some code that recieves arbitrary input and parses it as a regexp. To supress potential warnings I'm defining the `warn` method. Unfortunately it is not getting called:

```rb
def warn(...)
  puts "CALLED"
end

source = "/\w**/"
Regexp.new(source)
```

Running this emits a warning and doesn't print "CALLED":
```
$ ruby test.rb
test.rb:6: warning: regular expression has redundant nested repeat operator '*': /\/w**\//
```

I looked a bit at the code and found something which I think is supposed to handle this case but it seems like its not checking against the right thing: https://github.com/ruby/ruby/blob/4dbf386ca248df0f47f31dc28cdeabe8d4477e5b/regparse.c#L2986-L2994



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