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<img id="img_246" src="static/image/common/none.gif" zoomfile="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg" file="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg" class="zoom" />
<img id="img_246" src="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg" zoomfile="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg" file="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg" class="zoom" />
string str = "原来的字符串";//(<img id="img_246" src="static/image/common/none.gif"……)
string fileStr = Regex.Match(str, "(?<=\\sfile=[\"']).*?(?=[\"'])").ToString();
string newStr = Regex.Replace(str, "(?<=src=[\"']).*?(?=[\"'])", fileStr);
//这个newStr 就是你要的字符串
<script>
var stertre = '<img id="img_246" src="static/image/common/none.gif"
zoomfile="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg"
file="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg" class="zoom"
/><img id="img_246" src="static/image/common/none.gif"
zoomfile="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg"
file="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg" class="zoom"
/><img id="img_246" src="static/image/common/none.gif"
zoomfile="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg"
file="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg" class="zoom"
/>';
stertre = stertre.replace(/^\<img(.*?)file="(.*?)" (.*?)\/>\$/, '<img id="img_246"
src="$2" zoomfile="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg"
file="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg" class="zoom"
/>');
alert(stertre);
</script>
<script>
var stertre = '<img id="img_246" src="static/image/common/none.gif" zoomfile="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg" file="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg" class="zoom" />';
stertre = stertre.replace(/^<img(.*?)file="(.*?)" (.*?)\/>$/, '<img id="img_246" src="$2" zoomfile="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg" file="http://bbsnew.pic.aaa.com/pic/1121/11210213/month_1309/bbb.jpg" class="zoom" />');
alert(stertre);
</script>