How to substitute "-" every 4 characters?

Question

JavaScript

I need the string [a-zA-Z0-9], for example ABCDEF2GA3BCABCD to be converted to ABCD-EF2G-A3BC-ABCD.

Having messed up the regular expression, I could only get the first 4 separated by a hyphen, and then each character was separated.
I need the string to be split with a hyphen every 4 characters, with a tolerance of [a-zA-Z0-9].

Answer 1

str.replace(/\w{4}(?!$)/g, '$&-')
or
str.match(/\w{1,4}/g).join('-')