java code for regex of email validation

This question already has an answer here:

How to validate an email address using a regular expression? 74 answers

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Real world email validation is not so primitive task and it was already solved many times. I'd suggest you not to re-invent the wheel but use Apache Commons EmailValidator.

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

public class EmailValidator {

    private Pattern pattern;
    private Matcher matcher;

    private static final String EMAIL_PATTERN = 
        "^[_A-Za-z0-9-+]+(.[_A-Za-z0-9-]+)*@"
        + "[A-Za-z0-9-]+(.[A-Za-z0-9]+)*(.[A-Za-z]{2,})$";

    public EmailValidator() {
        pattern = Pattern.compile(EMAIL_PATTERN);
    }

    /**
     * Validate hex with regular expression
     * 
     * @param hex
     *            hex for validation
     * @return true valid hex, false invalid hex
     */
    public boolean validate(final String hex) {

        matcher = pattern.matcher(hex);
        return matcher.matches();

    }
}

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