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var str='<img alt="资料图:美国民兵-3洲际弹道导弹发射井" src="http://i2.sinaimg.cn/jc/2009-07-07/U2142P27T1D557974F26DT20090707101327.jpg" border="1" />'
var Pat = str.replace(/.*alt=[\"\']([^\'\"]*)[\"\'].*/,"$1");
alert(Pat)
<script language="javascript">
var str='<img alt="资料图:美国民兵-3洲际弹道导弹发射井" src="http://i2.sinaimg.cn/jc/2009-07-07/U2142P27T1D557974F26DT20090707101327.jpg" border="1" />';
var reg = /alt="([^"]*)"/;
if(reg.test(str))
{
document.write(RegExp.$1);
}
</script>
<script>
var str='<img alt="资料图:美国民兵-3洲际弹道导弹发射井" src="http://i2.sinaimg.cn/jc/2009-07-07/U2142P27T1D557974F26DT20090707101327.jpg" border="1" />';
str = str.replace(/[^alt]*alt=\"([^\"]*)\".*/gim,"$1");
alert(str)
</script>