This Java regex example demonstrates how to use Java regular expressions to validate email addresses with an example.

Java Regex email example

In the following example, we create a regex pattern for checking email addresses. This example provides only one possible solution.

package net.javaguides.corejava.regex;

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

public class JavaRegexEmail {

    public static void main(String[] args) {

        List < String > emails = Arrays.asList("ramesh@gmail.com",
            "tom@yahoocom", "34234sdfa#2345", "tony@gmail.com");

        String regex = "^[a-zA-Z0-9._-]+@[a-zA-Z0-9-]+\\.[a-zA-Z.]{2,18}$";

        Pattern p = Pattern.compile(regex);

        for (String email: emails) {

            Matcher m = p.matcher(email);

            if (m.matches()) {
                System.out.printf("%s matches%n", email);
            } else {
                System.out.printf("%s does not match%n", email);
            }
        }
    }
}

Output:

ramesh@gmail.com matches
tom@yahoocom does not match
34234sdfa#2345 does not match
tony@gmail.com matches

Reference

https://www.javaguides.net/2019/12/java-regex-tutorial-regular-expressions.html