regex 取得特殊字串中間的內容

string body = "<a href=\"http://google.com\">Google</a>";

MatchCollection matches = Regex.Matches(body
, "href=\"(?<item>[^\"]+)\""
, RegexOptions.IgnoreCase);
   
foreach (Match match in matches)
{
     string a = match.Groups["item"].Value;
     //oupt: http://google.com
}