Regex 1.8.0: Valid ?P<foo> -> ?<foo> triggers lint

[torsteingrindvik]

Summary

https://github.com/rust-lang/regex/blob/master/CHANGELOG.md
rust-lang/regex#955

A new feature was added to regex 1.8.0 which allows removing this P character.
The feature works, but clippy emits a false positive to it.

Lint Name

clippy::invalid_regex

Reproducer

use regex::Regex;

fn main() {
    let _re1 = Regex::new(r"(?P<hi>hi)").unwrap();

    // regex 1.8.0: Can now remove the P character
    let _re2 = Regex::new(r"(?<hi>hi)").unwrap();
    // ^-- clippy::invalid_regex
}

I saw this happen: Clippy complains.
I expected to see this happen: No complaints.

Version

rustc 1.71.0-nightly (8bdcc62cb 2023-04-20)
binary: rustc
commit-hash: 8bdcc62cb0362869f0e7b43a6ae4f96b953d3cbc
commit-date: 2023-04-20
host: x86_64-unknown-linux-gnu
release: 1.71.0-nightly
LLVM version: 16.0.2

Additional Labels

No response

[J-ZhengLi]

@rustbot claim