Use variable when checking for number of digits Regex in Javascript

Question

I need to check the following with 4 being the variable.

'1212'.match(/\d{4}/)

I know I can use '1212'.match(new RegExp(jamie)) to pass a variable into a regex, but then I don't know how to check for digits \d side of things.

RegExp() expects a string (or a regex pattern). So...

Andreas
– Andreas

2019-02-09 17:14:39 +00:00
Commented Feb 9, 2019 at 17:14 — Andreas
– Andreas, Commented Feb 9, 2019 at 17:14

Code Maniac · Accepted Answer · 2019-02-09 17:15:26Z

1

You can build a string with proper escaping and than using RegExp constructor you can build regex

let temp = 4
let reg = `\\d\{${temp}\}`
let regex = new RegExp(reg)

console.log('1212'.match(regex))

edited Feb 9, 2019 at 17:15

answered Feb 9, 2019 at 17:14

Code Maniac

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