how to include a variable value into regex pattern?

Question

I want to include a value of variable into regex pattern.

The following code is the familiar.

var regex = /(.)\1{2}/;

I want to do like The following.

var number = 2;
var regex = /(.)\1{number}/

How to do that ?

Answer 1

var number = 2;
var regex = new RegExp('(.)\\1{'+number+'}');