<script type="text/javascript">
var s1 = "W:\\Documentation Team Shares\\some folder\\Draft\\Some File name";
var s2 = "W:\\Documentation Team Shares\\some folder\\other folder\\Draft\\Some File name";
var s3 = "W:\\Documentation Team Shares\\some folder\\Draft\\Some File name.extension";
var re = /^W:\\Documentation Team Shares\\[\w\s]+\\Draft\\[\w\s\.]+$/;
alert(s1 + "\n" + re.test(s1));
alert(s2 + "\n" + re.test(s2));
alert(s3 + "\n" + re.test(s3));
</script>