How to Split with backward slash() in ServiceNow

(function executeRule(current, previous /*null when async*/ ) {
     var dept = current.department.name;
    gs.addErrorMessage("mainString=" + dept);
    var depSplit = dept.split("\\");
    gs.addErrorMessage("depSplit=" + depSplit[1]);
    var reDepartSpace = depSplit[1].replace(/[^a-zA-Z0-9]/g, '');
    gs.addErrorMessage("reDepartSpace=" + reDepartSpace);
    var gr = new GlideRecord("cmn_location");
    if (gr.get("name", reDepartSpace)) {
        current.location = gr.sys_id;
    }
 })(current, previous);

Output: