Javascript use variable inside match regex

Question

I have a simple regular expression inside a match function like this:

text.match(/.{1,20}/g);

Is it possible to replace the 20 with a dynamic variable?

Thanks a lot!

Answer 1

Use the RegExp constructor, not the literal. That allows you to do string concatenation or interpolation as you please:

let n = 20;
let r = new RegExp(".{1," + n + "}", "g");

text.match(r);

Answer 2

Try this:

> n = 3; text = 'abcd'; text.match(new RegExp(`.{1,${n}}`, 'g'));
[ 'abc', 'd' ]
>