MAJOR BUG: Numbers are Matched as Characters

[nokernelspace]

What version of regex are you using?

1.11.1

Describe the bug at a high level.

[A-Za-z]* matches with numbers [0-9]

What are the steps to reproduce the behavior?

    let ret = Regex::new(r"([A-Za-z]*)").unwrap().is_match("1");
    println!("{:?}", ret);

What is the actual behavior?

true

What is the expected behavior?

false

[nokernelspace]

Please fix, I need this for my lever.

[BurntSushi]

It's not a bug. It's correct. Your regex matches the empty string and every string, including the empty string, contains the empty string.

[nokernelspace]

https://regexr.com

is wrong do not use

[BurntSushi]

You are incorrect, there is no empty string. Try it on any other regex parser

TIL that I don't understand strings. Lol. But no, you are definitively wrong. The string 1 has two different valid spans that correspond to the empty string: &s[0..0] and &s[1..1].

And regexr is correct. If you click "Details," it shows the matches. What it doesn't do is highlight empty matches. That's poor UI. https://regex101.com/ will highlight empty matches. And regex101 supports the dialect of regex implemented by this crate, where as regexr doesn't.