IsValidIPAddress
Validates whether a string is a valid IPv4 address.
Source
public static bool IsValidIPAddress(this string s)
{
return Regex.IsMatch(s,
@"\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b");
}Example
//returns false
string s = "192.168.1.256";
bool b = s.IsValidIPAddress();
//returns true
string s = "192.168.1.254";
bool b = s.IsValidIPAddress();