Replace doesn't work as expected with `\b`

[emilio]

Feel free to close if this is really behaving as expected.

The following code:

extern crate regex;

use regex::Regex;

fn main() {
    let mut result = "                pub mErrorLine: root::nsTString<u16>,".to_owned();
    let r = Regex::new(r"\broot::nsTString<u16>\b").unwrap();
    
    result = r.replace_all(&result, "::nsstring::nsStringRepr").to_string();
    
    println!("{:?}", result);
}

Will not be able to replace the root::nsTString<u16>, while removing the last \b from the regex does.

[upsuper]

OK, I guess this actually works as expected. By definition, \b should be equal to (?<=\W)(?=\w)|(?<=\w)(?=\W), and both , and > are not word characters, so \b shouldn't match there. This behavior matches other regexp engines as well.

[BurntSushi]

Yup, this is as expected.