请教一个关于匹配的正则表达式

[eFrey]

示例字符串：

<img width=100 src="files.jpg"> This is a test page <img width=100 src="files2.jpg"> hello world, html test <img width=100 src="ffword.jpg"> from here, wodd. <span></span>

This is a test page <img width=100 src="files2.jpg"> hello world, html test <img width=100 src="ffword.jpg"> from here, wodd. <span></span>


取所有以"<img"开始和以"<span></span>"结束之间的字符串，但取到的字符串中只能含有一个"<img"

例如前面的字符串中需要取到"<img width=100 src="files2.jpg"> hello world, html test <img width=100 src="ffword.jpg"> from here, wodd. <span></span>"
而不是
<img width=100 src="files.jpg"> This is a test page <img width=100 src="files2.jpg"> hello world, html test <img width=100 src="ffword.jpg"> from here, wodd. <span></span>


请教这个正则表示式该如何取？

[Mr-Jee]

string str = @"<img width=100 src=""files.jpg""> This is a test page <img width=100 src=""files2.jpg""> hello world, html test <img width=100 src=""ffword.jpg""> from here, wodd. <span></span>

 This is a test page <img width=100 src=""files2.jpg""> hello world, html test <img width=100 src=""ffword.jpg""> from here, wodd. <span></span>";
            MatchCollection mc = Regex.Matches(str, @"<img((?!img)[\s\S])+?<span></span>");
            foreach (Match m in mc)
            {
                Console.WriteLine(m);
            }

[wuyq11]

string str="<img width=100 src=\"files.jpg\"> This is a test page <img width=100 src=\"files2.jpg\"> hello world, html test <img width=100 src=\"ffword.jpg\"> from here, wodd. <span></span>";
Regex reg = new Regex(@"(?is)<img\swidth=100[^>]*>(.*?)<span></span>");
MatchCollection mc = reg.Matches(str);
foreach (Match m in mc)
{
Console.Write(m.Groups[1].Value + "\n");
}
This is a test page <img width=100 src="files2.jpg"> hello world, html test <img width=100 src="ffword.jpg"> from here, wodd.

[eFrey]

2楼的是正解

[lovehong123]

string str="<img width=100 src=\"files.jpg\"> This is a test page <img width=100 src=\"files2.jpg\"> hello world, html test <img width=100 src=\"ffword.jpg\"> from here, wodd. <span></span>";
Regex reg = new Regex(@"(?is)<img\swidth=100[^>]*>(.*?)<span></span>");
MatchCollection mc = reg.Matches(str);
foreach (Match m in mc)
{
Console.Write(m.Groups[1].Value + "\n");
} This is a test page <img width=100 src="files2.jpg"> hello world, html test <img width=100 src="ffword.jpg"> from here, wodd.


二楼的这个是正确的，我试的！

[eFrey]

1 楼的也是对的，而且更通用一些。

另外想问一下，如果匹配出的字符串中同时需要有"keyword1"和"keyword2",一楼的正则表达式<img((?!img)[\s\S])+?<span></span>该如何修改呢？

[Jack2013tong]

楼上的可以，用正则分组

[eFrey]

怎么分组呢？

不能包含"<img"，但同时需要包含keyword1和keyword2.