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【Asp.Net】正则取出img中src
作者:scottckt / 发布于2011/6/22/ 729
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有下例Html代码 

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--><span style="color: #0000ff"><</span><span style="color: #800000">div</span><span style="color: #0000ff">></span><span style="color: #000000">
</span><span style="color: #0000ff"><</span><span style="color: #800000">img </span><span style="color: #ff0000">alt</span><span style="color: #0000ff">='' </span><span style="color: #ff0000">src</span><span style="color: #0000ff">="/UpLoad/image/111.jpg"</span><span style="color: #ff0000"> </span><span style="color: #0000ff">/><</span><span style="color: #800000">img </span><span style="color: #ff0000">alt</span><span style="color: #0000ff">='' </span><span style="color: #ff0000">src</span><span style="color: #0000ff">='/UpLoad/image/222.jpg' </span><span style="color: #0000ff">/><</span><span style="color: #800000">img
</span><span style="color: #ff0000">src</span><span style="color: #0000ff">='./UpLoad/image/333.jpg' </span><span style="color: #ff0000">alt</span><span style="color: #0000ff">='' </span><span style="color: #0000ff">/></</span><span style="color: #800000">div</span><span style="color: #0000ff">></span><span style="color: #000000">
</span><span style="color: #0000ff"><</span><span style="color: #800000">div</span><span style="color: #0000ff">></span><span style="color: #000000">
</span><span style="color: #0000ff"><</span><span style="color: #800000">img </span><span style="color: #ff0000">alt</span><span style="color: #0000ff">='' </span><span style="color: #ff0000">src</span><span style="color: #0000ff">='/UpLoad/image/444.jpg' </span><span style="color: #0000ff">/></span><span style="color: #000000">
</span><span style="color: #0000ff"><</span><span style="color: #800000">img </span><span style="color: #ff0000">src</span><span style="color: #0000ff">='../sa/UpLoad/image/333.jpg' </span><span style="color: #ff0000">alt</span><span style="color: #0000ff">='' </span><span style="color: #0000ff">/></span><span style="color: #000000">
</span><span style="color: #0000ff"></</span><span style="color: #800000">div</span><span style="color: #0000ff">></span></div>
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现在要取出img中的src。正则的写法如下：
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--><span style="color: #000000"><</span><span style="color: #000000">img[</span><span style="color: #000000">^></span><span style="color: #000000">]</span><span style="color: #000000">*</span><span style="color: #000000">src\s</span><span style="color: #000000">*=</span><span style="color: #000000">\s</span><span style="color: #000000">*</span><span style="color: #000000">[</span><span style="color: #800000">'</span><span style="color: #800000">"]([\w/\-\.]*)[</span><span style="color: #800000">'"</span><span style="color: #800000">][^>]*</span></div>
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解释：

<span style="color: #000000"><</span><span style="color: #000000">img[</span><span style="color: #000000">^></span><span style="color: #000000">]</span><span style="color: #000000">*</span>　　：查找以<img开头，以>终止的内容。
<span style="color: #000000">src\s</span><span style="color: #000000">*=</span><span style="color: #000000">\s</span><span style="color: #000000">*</span><span>[</span><span>'</span><span>"]([\w/\-\.]*)[</span><span>'"</span><span>][^>]*</span>:查找src开头，以>终止的内容，并取src中内容。

\s*　　　　 ：0或多个空格
<span>[</span><span>'</span><span>"]</span>　　　　<span>：</span>取一个'或&ldquo;。
<span>([\w/\-\.]*)</span><span> ：</span>取单词字符，包含_/-.等字符。()，表示用<span style="color: #000000">Groups</span>方式取到值。

用法： 

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--><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> FindImageInXmlMethod()
{
</span><span style="color: #0000ff">string</span><span style="color: #000000"> ImgXml </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #800000">"</span><span style="color: #800000"> <div><img alt='' src=\</span><span style="color: #800000">"</span><span style="color: #000000">/</span><span style="color: #000000">UpLoad</span><span style="color: #000000">/</span><span style="color: #000000">image</span><span style="color: #000000">/</span><span style="color: #800080">111</span><span style="color: #000000">.jpg\</span><span style="color: #800000">"</span><span style="color: #800000"> /><img alt='' src='/UpLoad/image/222.jpg' /><img src='./UpLoad/image/333.jpg' alt='' /></div></span><span style="color: #800000">"</span><span style="color: #000000">
</span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #800000">@"</span><span style="color: #800000"><div><img alt='' src='/UpLoad/image/444.jpg' />
<img src='../sa/UpLoad/image/333.jpg' alt='' />
</div></span><span style="color: #800000">"</span><span style="color: #000000">;

</span><span style="color: #0000ff">string</span><span style="color: #000000"> RegEx </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #800000">"</span><span style="color: #800000"><img[^>]*src\\s*=\\s*['\</span><span style="color: #800000">"</span><span style="color: #000000">]([\\w</span><span style="color: #000000">/</span><span style="color: #000000">\\</span><span style="color: #000000">-</span><span style="color: #000000">\\.]</span><span style="color: #000000">*</span><span style="color: #000000">)[</span><span style="color: #800000">'</span><span style="color: #800000">\"][^>]*";</span><span style="color: #800000">
</span><span style="color: #000000">Regex imgRegex </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> Regex(RegEx,RegexOptions.IgnoreCase);

MatchCollection matchCollection </span><span style="color: #000000">=</span><span style="color: #000000"> imgRegex.Matches(ImgXml);
</span><span style="color: #0000ff">foreach</span><span style="color: #000000"> (Match matchItem </span><span style="color: #0000ff">in</span><span style="color: #000000"> matchCollection)
{
</span><span style="color: #0000ff">string</span><span style="color: #000000"> val </span><span style="color: #000000">=</span><span style="color: #000000"> matchItem.Value;
val </span><span style="color: #000000">=</span><span style="color: #000000"> matchItem.Groups[</span><span style="color: #800080">1</span><span style="color: #000000">].Value;
Response.Write(val </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #800000">"</span><span style="color: #800000"><br/></span><span style="color: #800000">"</span><span style="color: #000000">);
}
}</span></div>
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结果：

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--><span style="color: #000000">/</span><span style="color: #000000">UpLoad</span><span style="color: #000000">/</span><span style="color: #000000">image</span><span style="color: #000000">/</span><span style="color: #800080">111</span><span style="color: #000000">.jpg
</span><span style="color: #000000">/</span><span style="color: #000000">UpLoad</span><span style="color: #000000">/</span><span style="color: #000000">image</span><span style="color: #000000">/</span><span style="color: #800080">222</span><span style="color: #000000">.jpg
.</span><span style="color: #000000">/</span><span style="color: #000000">UpLoad</span><span style="color: #000000">/</span><span style="color: #000000">image</span><span style="color: #000000">/</span><span style="color: #800080">333</span><span style="color: #000000">.jpg
</span><span style="color: #000000">/</span><span style="color: #000000">UpLoad</span><span style="color: #000000">/</span><span style="color: #000000">image</span><span style="color: #000000">/</span><span style="color: #800080">444</span><span style="color: #000000">.jpg
..</span><span style="color: #000000">/</span><span style="color: #000000">sa</span><span style="color: #000000">/</span><span style="color: #000000">UpLoad</span><span style="color: #000000">/</span><span style="color: #000000">image</span><span style="color: #000000">/</span><span style="color: #800080">333</span><span style="color: #000000">.jpg

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</blockquote>
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