/// <summary>
/// Ip地址验证
/// </summary>
public static bool CheckIp(string ip)
{
  bool result = false;
  Regex ipReg = new Regex(@"^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$");
  if (ipReg.IsMatch(ip))
  {
    result = true;
  }
  return result;
}

/// <summary>
/// 价格验证
/// </summary>
/// <param name="priceStr"></param>
/// <returns></returns>
public bool CheckPrice(string priceStr)
{
  bool result = false;
  Regex regex = new Regex(@"^\d+(\.\d{1,2})?$", RegexOptions.IgnoreCase);
  Match match = regex.Match(priceStr);
  if (match.Success)
  {
    result = true;
  }
  return result;
}

/// <summary>
/// 正整数验证
/// </summary>
public static bool CheckPositiveInteger(string numStr)
{
  bool result = false;
  Regex regex = new Regex(@"^[1-9]\d*$", RegexOptions.IgnoreCase);
  Match match = regex.Match(numStr);
  if (match.Success)
  {
    result = true;
  }
  return result;
}