display order negative validation

smart_service/masters/doctype/vehicle/vehicle.js

@@ -88,7 +88,6 @@ frappe.ui.form.on('Vehicle', {
             frappe.throw(__("Just a <b>.</b> is not prescribed!"));
             frappe.validated = false;
         }
-        //var regex = /^[A-Za-z0-9&-()@/,.<>_ ]*$/;
         var regex = /[!@#$%^&*()_+\=\[\]{};'`~:"\\|.<>\/?]+/;
         if (frm.doc.vehicle) {
             if (regex.test(frm.doc.vehicle) === true) {
@@ -102,6 +101,12 @@ frappe.ui.form.on('Vehicle', {
             }
         }
 
+        var regex = /[!@#$%^&*()_+-\=\[\]{};'`"\\|.<>\/?]+/;
+            if (regex.test(frm.doc.display_order) === true) {
+                frappe.throw(__("<b>Display Order:</b> negative values not allowed."));
+                frappe.validated = false;
+        }
+
         if (frm.doc.display_order && frm.doc.vehicle && frm.doc.vehicle_segment && !frm.is_new()) {
             //*** check if there is same display_order
             frappe.db.get_list('Vehicle', {

smart_service/masters/doctype/vehicle_segment/vehicle_segment.js

@@ -48,7 +48,11 @@ frappe.ui.form.on('Vehicle Segment', {
 	        frappe.throw(__("Just a <b>.</b> is not prescribed!"));
 	        frappe.validated = false;
 	    }
-       //var regex = /^[A-Za-z0-9&-()@/,.<>_ ]*$/;
+        var regex = /[!@#$%^&*()_+-\=\[\]{};'`"\\|.<>\/?]+/;
+            if (regex.test(frm.doc.display_order) === true) {
+                frappe.throw(__("<b>Display Order:</b> negative values not allowed."));
+                frappe.validated = false;
+        }
         var regex = /[!@#$%^&*()_+\-=\[\]{};'`~:"\\|,.<>\/?]+/;
         if(frm.doc.vehicle_segment){
         if (regex.test(frm.doc.vehicle_segment) === true){