用正则表达式判断是不是正确的IP地址的代码
/// <summary> /// 判断是否是Ip地址 /// </summary> /// <param name="str1"></param> /// <returns></returns> public static bool IsIPAddress(string str1) { if (str1 == null || str1 == string.Empty || str1.Length < 7 || str1.Length > 15) return false; string regformat = @"^\d{1,3}[\.]\d{1,3}[\.]\d{1,3}[\.]\d{1,3}$"; Regex regex = new Regex(regformat, RegexOptions.IgnoreCase); return regex.IsMatch(str1); }