Interpolation in a regex

Question

I need to add interpolation in a regex.

what I have right now is var re = /212.129.52.45/gi what i need is to replace the 212.129.52.45 with ip_appress

Answer 1

use the Regexp constructor instead

const ip_address = '217.138.216.62'

const re = new RegExp(`^${ip_address.replace(/\./g, '\\.')}$`, 'gi')

console.log(re.test('217.138.216.62'))

console.log(re.test('217.138.216.6'))

Here we are using Boundary-type Assertions (^ and $) to match when only the full pattern is found from start-to-end.