Dexie.js using variable in LIKE operator

General
1

im using this code

var db = new Dexie("likeTest");
db.version(1).stores({
friends: "name,age"
});
db.on('populate', function() {
db.friends.add({name: "Foo Barsson", age: 33});
});
db.open();
db.friends.filter (function (friend) { return /Bar/.test(friend.name); })
.toArray()
.then(function(result) {
    alert ("Found " + result.length + " friends containing the word 'Bar' in its name...");
});

I wanted to know how I can use a variable instead of the search?

Ex.

var VarTest = 'Dani';
db.friends.filter (function (friend) { return /VarTest/.test(friend.name); })