String variable dynamic bind

Issue

I have this code .replace(/^(\d{0,3})(\d{0,2})/, '($1) $2');.

I want to pass variable to make 3 dynamic.

I tried .replace(/^(\d{0,code.length})(\d{0,2})/, '($1) $2');

Thank you.

Solution

You can use RegExp to fill your parameters up

const code = {
   length: 3
}
const regex = new RegExp(`^(\d{0,${code.length}})(\d{0,2})`)
console.log(regex)

Answered By - Nick Vu