Ultimate Java Regular Expression to validate any email address.
February 1, 2009
My post about Java regular expression gets a lot of hits daily. Someone commented that the regular expression I included in that post does not block certain invalid email addresses. So I updated the Java regular expression to validate email address. I am pretty sure that the following Java regular expression will validate any email address.
“^[\\w\\-]([\\.\\w])+[\\w]+@([\\w\\-]+\\.)+[A-Z]{2,4}$”;
Here is an example Java program to test this regular expression for email address validation.
import java.util.regex.Matcher; import java.util.regex.Pattern; public class ValidateEmailAddress{
public boolean isValidEmailAddress(String emailAddress){ String expression=“^[\\w\\-]([\\.\\w])+[\\w]+@([\\w\\-]+\\.)+[A-Z]{2,4}$”; CharSequence inputStr = emailAddress; Pattern pattern = Pattern.compile(expression,Pattern.CASE_INSENSITIVE); Matcher matcher = pattern.matcher(inputStr); return matcher.matches();
} public static void main(String args[]){ ValidateEmailAddress vea = new ValidateEmailAddress(); String emailAddress = “ab.cd@xyz.com”; if(vea.isValidEmailAddress(emailAddress)){ System.out.println(emailAddress + “ is a valid email address.“); }else{ System.out.println(emailAddress + “ is an invalid email address.”); } } }
Give this regular expression a try. I am confident that no invalid email can get through this regular expression.
Enjoy.