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Following the DRY (Don't Repeat Yourself) principle, Hibernate Validator let's you express your domain constraints once (and only once) and ensure their compliance at various level of your system automatically.

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//$Id: EmailValidator.java 15765 2009-01-09 14:56:30Z hardy.ferentschik $
package org.hibernate.validator;

import java.io.Serializable;
import java.util.regex.Matcher;

/**
 * Check that a given string is a well-formed email address
 *
 * @author Emmanuel Bernard
 */
public class EmailValidator implements Validator, Serializable {
	//TODO: Implement this http://www.ex-parrot.com/~pdw/Mail-RFC822-Address.html regex in java
	private static String ATOM = "[^\\x00-\\x1F^\\(^\\)^\\<^\\>^\\@^\\,^\\;^\\:^\\\\^\\\"^\\.^\\[^\\]^\\s]";
	private static String DOMAIN = "(" + ATOM + "+(\\." + ATOM + "+)*";
	private static String IP_DOMAIN = "\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\]";

	private java.util.regex.Pattern pattern;

	public boolean isValid(Object value) {
		if ( value == null ) return true;
		if ( !( value instanceof String ) ) return false;
		String string = (String) value;
		if ( string.length() == 0 ) return true;
		Matcher m = pattern.matcher( string );
		return m.matches();
	}

	public void initialize(Email parameters) {
		pattern = java.util.regex.Pattern.compile(
				"^" + ATOM + "+(\\." + ATOM + "+)*@"
						 + DOMAIN
						 + "|"
						 + IP_DOMAIN
						 + ")$",
				java.util.regex.Pattern.CASE_INSENSITIVE
		);
	}
}