regexp模式帮助java/groovy

import java.util.regex.Pattern;
import java.util.regex.Matcher;

public class RegexExample {
    public static void main(String[] args) {
        String email = "example@example.com";
        String regex = "^[\\w-\\.]+@([\\w-]+\\.)+[\\w-]{2,4}$";

        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(email);

        if (matcher.matches()) {
            System.out.println("Valid email address");
        } else {
            System.out.println("Invalid email address");
        }
    }
}

def email = "example@example.com"
def regex = /^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/

if (email ==~ regex) {
    println "Valid email address"
} else {
    println "Invalid email address"
}