The regex parse error while the expre is correct !

[GostGrimmy]

Thanks for your work

Thanks you for this project, I am a new one study rust, I use this lib have some problem.

regex version

1.10.3

code

use regex::Regex;

#[test]
fn test_is_email() {
    // let a = is_email(&"[email protected]".to_string());
    // assert_eq!(a, true);
    let r = Regex::new(r"^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$").unwrap();
    let aa = r.is_match("[email protected]");
    assert_eq!(aa,true)
}

The output in termainal

running 1 test
thread 'tests::form_test::test_is_email' panicked at src/tests/form_test.rs:9:61:
called `Result::unwrap()` on an `Err` value: Syntax(
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
regex parse error:
    ^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$
      ^^
error: invalid range boundary, must be a literal

[BurntSushi]

The regex is not valid. The error message is both telling you the problem and pointing you to where it occurs. A - in a character class indicates a range. Both sides of a range must be a literal character (or absent, i.e., adjacent to the open or close of a class as in [\w-]), but \w is itself another character class. You likely either want [\w\-.] or [-\w.]. Incidentally, your escaping of . inside a character class is superfluous because a . has no special meaning inside of a class.

[GostGrimmy]

Thanks very much.