正则总结

/**
 * 验证邮箱
 *
 * @param email
 * @return
 */
public static boolean checkEmail(String email) {
    boolean flag = false;
    try {
        String check = "^([a-z0-9A-Z]+[-|_|\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\.)+[a-zA-Z]{2,}$";
        Pattern regex = Pattern.compile(check);
        Matcher matcher = regex.matcher(email);
        flag = matcher.matches();
    } catch (Exception e) {
        flag = false;
    }
    return flag;
}