rustHow to use negation in Rust regex?

Negation in Rust regex can be used to match any character except the one specified. To use negation, the ^ character is used inside a character set [].

For example, the following code will match any character except a:

let re = Regex::new(r"[^a]").unwrap();
assert!(re.is_match("b"));

The code consists of the following parts:

1. Regex::new(r"[^a]") - creates a new Regex object with the pattern [^a], which matches any character except a
2. unwrap() - unwraps the Result object returned by Regex::new()
3. assert!(re.is_match("b")) - checks if the Regex object re matches the string b

For more information, see the Rust Regex documentation.

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