Regex r = new Regex("<img[^>]+title=\"([^\"]*)\" src=\"([^\"]*)\"[^>]+/>");
        string str = "<p>as</p><p><img style=\"float:none\" title=\"1111你好\" src=\"/upload/images/20120822144451781.jpg\" /></p><p><img style=\"float:none\" title=\"222您也好\" src=\"/upload/images/20120822144451843.jpg\" /></p><p></p>;}";
        MatchCollection mc =r.Matches(str);
        string s = "";
        foreach (Match m in mc)
        {
            s += m.Groups[2] + "|" + m.Groups[1] + ",";           
        }
        string aa = s.TrimEnd(',');
//aa=/upload/images/20120822144451781.jpg|1111你好,/upload/images/20120822144451843.jpg|222您也好

------解决方案--------------------

探讨


<p>
        <img style="float:none" title="1" src="/upload/images/20120822162206703.jpg" />
</p>
<p>
        <img style="float:none" title="22" src="/upload/images/20120822162206703.jpg" />
</p>……