use simple_regex::RegexBuilder;
fn main() {
let builder: RegexBuilder = RegexBuilder::new().bound_word(
RegexBuilder::new()
.character_class("A-Za-z0-9._%+-")
.literal('@')
.character_class("A-Za-z0-9.-")
.literal('\\')
.dot()
.exact_repetitions(RegexBuilder::new().character_class("A-Za-z"), 2)
);
let regex = builder.to_regex_or_panic();
println!("{}", regex.is_match("asasinbro3@gmail.com"));
println!("{}", regex.is_match("ABC@gmail.az"));
}