/[^\\\/]*[\\\/]+/g
<script type="text/javascript"> function getFileName(str){ var reg = /[^\\\/]*[\\\/]+/g; //xxx\或者是xxx/ str = str.replace(reg,''); return str; } var str = "c:\\p_w_picpaths\\tupian\\006.jpg"; document.write(getFileName(str)+'<br />'); var str2 = "c:/p_w_picpaths/tupian/test2.jpg"; document.write(getFileName(str2)); </script>