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var str = 'D:\\eclipse\\apache-tomcat-7.0.23\\webapps\\LastProject\\uploads\\20125914035913.jpg';
var ar = str.split('\\');
var result = ar[ar.length - 2] + '\\' + ar[ar.length - 1];
alert(result);
<!DOCTYPE HTML>
<html>
<head>
<meta charset="gb2312" />
<title></title>
</head>
<body>
<div id="test">
D:\eclipse\apache-tomcat-7.0.23\webapps\LastProject\uploads\20125914035913.jpg
</div>
<script>
function $(el){
return typeof el == 'string' ? document.getElementById(el) : el;
}
var s = $('test').innerHTML;
var r = /uploads\\\d+\.jpg/;
alert(s.match(r))
</script>
</body>
</html>