正则提取问题--新手问题

Question

网页源码中含有
<a class="cur" id="prePage" href="/bh/gg/18-55/p/1325606664948/" onclick="return go($('#prePage'),'p','/bh/gg/18-55/p/1325606664948/');">&lt;&lt;上一页 </a>               <a   class="cur"  id="nextPage" href="/bh/gg/18-55/n/1325554658899/" onclick="return go($('#nextPage'),'n','/bh/gg/18-55/n/1325554658899/');">下一页 &gt;&gt;</a><a target="_blank" href="/user/4130797266183">我要取出
/bh/gg/18-55/p/1325606664948/
/bh/gg/18-55/n/1325554658899/
/user/4130797266183中的4130797266183请教代码！

Answer 1

(?<=<a[^>]*?href=")[^"]+(?=")

Answer 2

   string tempStr = "<a class=\"cur\" id=\"prePage\" href=\"/bh/gg/18-55/p/1325606664948/\" onclick=\"return go($('#prePage'),'p','/bh/gg/18-55/p/1325606664948/');\">&lt;&lt;上一页 </a>                                    <a   class=\"cur\"  id=\"nextPage\" href=\"/bh/gg/18-55/n/1325554658899/\" onclick=\"return go($('#nextPage'),'n','/bh/gg/18-55/n/1325554658899/');\">下一页 &gt;&gt;</a>";
                string pattern = @"(?i)<a[^>]*href=(['""]?)([^'""]+)\1.*?>";
                foreach (Match m in Regex.Matches(tempStr, pattern))
                {
                    //循环输出
                    string value = m.Groups[2].Value;
                    /* 匹配内容
                       /bh/gg/18-55/p/1325606664948/
                       /bh/gg/18-55/n/1325554658899/      
                 */
                }
                string str = "<a target=\"_blank\" href=\"/user/4130797266183\">";
                str = Regex.Match(str, @"<a[^>]+href=(['""]?).*?(\d+)\1.*?>").Groups[2].Value;//4130797266183