关于正则表达式替换的问题~~~~请高手帮忙

[yipiaoqingshui]

要替换的文本
<P><IMG src="Cache/HtmlEditorAccessory/2005-05-17/ee4a25c5-def3-45e7-a51b-fab5672f8bc4.gif" border=0><IMG src="Cache/HtmlEditorAccessory/2005-05-16/d082f4eb-8dee-4ae4-b561-d35b1833623d.gif" border=0></P>

问题是:
要在Cache/HtmlEditorAccessory前面加上一个一个域名.这个域名通sysVariable.SecurityAppURLBase
调用获取

可是不知道如何写这个函数....没用过正则表达

[saucer]

if you know you just want to add something before "Cache/HtmlEditorAccessory", you don't need to use regex, you could just do

string s = "....";
s = s.Replace("Cache/HtmlEditorAccessory/","http://www.csdn.net/Cache/HtmlEditorAccessory/");

or if you insist, try something like

string s1 = "http://www.csdn.net/"; //sysVariable.SecurityAppURLBase

string s = "<P><IMG src=\"Cache/HtmlEditorAccessory/2005-05-17/ee4a25c5-def3-45e7-a51b-fab5672f8bc4.gif\" border=0><IMG src=\"Cache/HtmlEditorAccessory/2005-05-16/d082f4eb-8dee-4ae4-b561-d35b1833623d.gif\" border=0></P>";

s = Regex.Replace(s, @"(?<=IMG[^>]+src=[""']?)(Cache/HtmlEditorAccessory/)", s1 + "$1", RegexOptions.IgnoreCase);

Console.WriteLine(s);

[yipiaoqingshui]

thank you~