C#判断IP地址是否合法函数-使用正则表达式-2个

public bool IsCorrenctIP(string ip)
{
string pattrn=@"(/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(System.Text.RegularExpressions.Regex.IsMatch(ip,pattrn))
{
return true;
}
else
{
return false;

}
}

public bool IsValidIP(string ip)
{
if (System.Text.RegularExpressions.Regex.IsMatch(ip,"[0-9]{1,3}//.[0-9]{1,3}//.[0-9]{1,3}//.[0-9]{1,3}"))
{
string[] ips = ip.Split('.');
if (ips.Length == 4 || ips.Length == 6)
{
if(System.Int32.Parse(ips[0]) < 256 && System.Int32.Parse(ips[1]) < 256 & System.Int32.Parse(ips[2]) < 256 & System.Int32.Parse(ips[3]) < 256)
return true;
else
return false;
}
else
return false;

}
else
return false;
}