[ruby-core:115889] [Ruby master Bug#20084] Breaking change with Regexp.new on 3.3.0

Issue #20084 has been reported by paddor (Patrik Wenger).

----------------------------------------
Bug #20084: Breaking change with Regexp.new on 3.3.0
https://bugs.ruby-lang.org/issues/20084

* Author: paddor (Patrik Wenger)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.3.0 (2023-12-25 revision 5124f9ac75) [x86_64-linux]
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
Regexp.new used to take up to 3 arguments, but now only 1..2 are allowed:

```
[1] pry(main)> Regexp.new 'abc', 'i', 'n'
ArgumentError: wrong number of arguments (given 3, expected 1..2)
from (pry):1:in `initialize'
```


On 3.2.2:
```
[1] pry(main)> Regexp.new 'abc', 'i', 'n'
=> /abc/in
```



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