How to Validate Email Addresses in Java Using Regular Expressions?

How to Use Regex to Validate Email Addresses in Java

Regex is not the recommended method for email validation, but for testing purposes, it can be useful. Here's how to use it in Java:

Code:

Pattern p = Pattern.compile("[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}");

In Java, the code:

Matcher m = p.matcher("[email protected]");
if (m.find())
    System.out.println("Correct!");

However, this regex may fail to match well-formed email addresses.

Solution:

Here's a better alternative:

public static final Pattern VALID_EMAIL_ADDRESS_REGEX = 
    Pattern.compile("^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,6}$", Pattern.CASE_INSENSITIVE);

public static boolean validate(String emailStr) {
        Matcher matcher = VALID_EMAIL_ADDRESS_REGEX.matcher(emailStr);
        return matcher.matches();
}

This regex and Java code should reliably validate email addresses.

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