誰能詳細(xì)的幫我解釋下正則表達(dá)式中判斷是否是ip的這個(gè)例子
public bool IsIp(string StrData)
{
if (StrData == null || StrData == string.Empty)
return false;

Regex res = new Regex(@"^((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)$");
return res.IsMatch(StrData);
}