判断是否为邮箱

public static boolean isValidEmail(String paramString) {

   String regex = "[a-zA-Z0-9_\\.]{1,}@(([a-zA-z0-9]-*){1,}\\.){1,3}[a-zA-z\\-]{1,}";
   if (paramString.matches(regex)) {
      return true;
   } else {
      return false;
   }
}