截取html字符串
郁闷，这个该怎么做。。。。
以获取的字符串如下
<P   align=center> <IMG   src= "http://www1.ff369.com/2006/08/20/7/1.jpg "> </P>

<P   align=center> <IMG   src= "http://www1.ff369.com/2006/08/20/7/2.jpg "> </P>

<P   align=center> <IMG   src= "http://www1.ff369.com/2006/08/20/7/3.jpg "> </P>

<P   align=center> <IMG   src= "http://www1.ff369.com/2006/08/20/7/4.jpg "> </P>

<P   align=center> <IMG   src= "http://www1.ff369.com/2006/08/20/7/5.jpg "> </P>

<P   align=center> <IMG   src= "http://www1.ff369.com/2006/08/20/7/6.jpg "> </P>

<P   align=center> <IMG   src= "http://www1.ff369.com/2006/08/20/7/7.jpg "> </P>


处理后获取第一个IMG的值，即src= "http://www1.ff369.com/2006/08/20/7/1.jpg

请说明思路以及方法

------解决方案--------------------
Response.Write(Regex.Replace( " <P align=center> <IMG src=\ "http://www1.ff369.com/2006/08/20/7/1.jpg\ "> </P> ", @ " <img\s+(? <src> src= " "?[^ " "\s> ]* " "?)> ", "${src} ", RegexOptions.IgnoreCase));

------解决方案--------------------
如果可能这样
<P align=center> <IMG border= "1 " ............. src=\ "http://www1.ff369.com/2006/08/20/7/1.jpg\ " adddd.......> </P>


Response.Write(Regex.Replace( " <P align=center> <IMG src=\ "http://www1.ff369.com/2006/08/20/7/1.jpg\ "> </P> ", @ " <img\s+.*?(? <src> src= " "?[^ " "\s> ]* " "?).*?> ", "${src} ", RegexOptions.IgnoreCase));
------解决方案--------------------
正则啊~！
string sourceString = @ " <P align=center> <IMG src= " "http://www1.ff369.com/2006/08/20/7/1.jpg " "> </P>

<P align=center> <IMG src= " "http://www1.ff369.com/2006/08/20/7/2.jpg " "> </P>

<P align=center> <IMG src= " "http://www1.ff369.com/2006/08/20/7/3.jpg " "> </P>

<P align=center> <IMG src= " "http://www1.ff369.com/2006/08/20/7/4.jpg " "> </P>

<P align=center> <IMG src= " "http://www1.ff369.com/2006/08/20/7/5.jpg " "> </P>

<P align=center> <IMG src= " "http://www1.ff369.com/2006/08/20/7/6.jpg " "> </P>

<P align=center> <IMG src= " "http://www1.ff369.com/2006/08/20/7/7.jpg " "> </P> ";
System.Text.RegularExpressions.MatchCollection results = Regex.Matches(sourceString,@ "src= " "([^ " "]*) ",System.Text.RegularExpressions.RegexOptions.IgnoreCase);
foreach(Match result in results)
{
WL(result.Groups[1].Value);
}

//////////////////////////////////////////////
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------解决方案--------------------
string str = " <P align=center> <IMG src=\ "http://www1.ff369.com/2006/08/20/7/1.jpg\ "> </P> ";

str = str.Replace( " <P align=center> <IMG src=\ " ", " ");
str = str.Replace( "\ "> </P> ", " ");