diff --git a/static/scripts/search.js b/static/scripts/search.js
index 6ca2b0f..1d7f8b0 100644
--- a/static/scripts/search.js
+++ b/static/scripts/search.js
@@ -1,16 +1,12 @@
 
 var searchAttr = 'data-search-mode';
 function contains(a,m){
-    if (m.length < 3) {
-      return false;
-    }
-  
-    return (a.textContent || a.innerText || "").toUpperCase().indexOf(m[3].toUpperCase())>=0;
+    return (a.textContent || a.innerText || "").toUpperCase().includes(m)
 };
 
 //on search
 document.getElementById("nav-search").addEventListener("keyup", function(event) {
-    var search = this.value;
+    var search = this.value.toUpperCase();
 
     if (!search) {
         //no search, show all results
@@ -49,23 +45,23 @@ document.getElementById("nav-search").addEventListener("keyup", function(event)
             elem.parentNode.style.display = "block";
         });
         //hide parents without children
-        document.querySelectorAll("nav > ul > li").forEach(function(parent){
+        document.querySelectorAll("nav > ul > li").forEach(function(parent) {
             var countSearchA = 0;
-            parent.querySelectorAll("a").forEach((elem) >= {
+            parent.querySelectorAll("a").forEach(function(elem) {
                 if (contains(elem, search)) {
                     countSearchA++;
                 }
-            }
+            });
             
             var countUl = 0;
-            parent.querySelectorAll("ul").forEach((elem) >= {
-                if (contains(elem, search)) {
+            var countUlVisible = 0;
+            parent.querySelectorAll("ul").forEach(function(ulP) {
+                // count all elements that match the search
+                if (contains(ulP, search)) {
                     countUl++;
                 }
-            }
-            
-            var countUlVisible = 0;
-            parent.querySelectorAll("ul").forEach((ulP) >= {
+                
+                // count all visible elements
                 var children = ulP.children
                 for (i=0; i<children.length; i++) {
                     var elem = children[i];
@@ -73,9 +69,9 @@ document.getElementById("nav-search").addEventListener("keyup", function(event)
                         countUlVisible++;
                     }
                 }
-            }
+            });
           
-            if(countSearchA == 0 && countUl === 0){
+            if (countSearchA == 0 && countUl === 0){
                 //has no child at all and does not contain text
                 parent.style.display = "none";
             } else if(countSearchA == 0 && countUlVisible == 0){