Update AB Check

Author: abx20

AB Check

@@ -19,14 +19,11 @@
 *    3) Else return false                                                              *
 *                                                                                      *
 ***************************************************************************************/
-function ABCheck(str) { 
-
-  var match = str.search(/a...b/);
-  if (match > -1) {
-    return "true";
+function ABCheck(str) {
+  for (let i = 0; i < str.length - 4; i++) {
+    if ((str[i] === 'a' && str[i + 4] === 'b') || (str[i] === 'b' && str[i + 4] === 'a')) {
+      return true;
+    }
   }
-  else {
-    return "false";
-  }
-         
+  return false;
 }