匹配img标签及img 的src的正则表达式

text中img标签：

<IMG height=375 alt="" src="http://www.mycreative.com.cn/upload/2010/4/tiancheng2.jpg" width=500>
<IMG alt="" src="http://www.mycreative.com.cn/upload/2010/4/s2.jpg">

匹配img标签的正则表达式：string Pattern = @"<img/s+[^>]*/s*src/s*=/s*([']?)(?<url>/S+)'?[^>]*>";

匹配img 的src的正则表达式：string Pattern = @"(?<=src/s*=/s*[/'/""]?)(?<url>[http/:////]?[^'""]+)";

匹配结果：http://www.mycreative.com.cn/upload/2010/4/tiancheng2.jpg

获取text中img的src地址：

string Pattern = @"(?<=src/s*=/s*[/'/""]?)(?<url>[http/:////]?[^'""]+)";

Regex reg = new Regex(Pattern, RegexOptions.IgnoreCase);
MatchCollection colMatch = reg.Matches(text文本);

StringBuilder strImage = new StringBuilder();
if (colMatch.Count > 0)
{
foreach (Match m in colMatch)
{
strImage.Append(m.Value).Append(',');

}
}

匹配text的img,并给img标签加上链接

string Pattern = @"<img/s+[^>]*/s*src/s*=/s*([']?)(?<url>/S+)'?[^>]*>";

Regex reg = new Regex(Pattern, RegexOptions.IgnoreCase);
MatchEvaluator myEvaluator=new MatchEvaluator(RepleaceReg);
string content = reg.Replace(text文本), myEvaluator);

RepleaceReg函数:

private string RepleaceReg(Match m)
{
string result=m.ToString();

if (albumid != -1)
{
result="<a href=ImageShow.aspx?albumid=" + albumid + ">" + m + "</a>";
}
return result;
}