How to use replace() as adding '.' between the numbers?

Question

Using Javascript, if my number is 5899, I want to insert a decimal point between the numbers to get the result of 58.99. I know (num/100).toFixed(2) would work, but just wondering if there is a way for using replace.

Answer 1

A regular expression can look ahead for 2 digits followed by the end of the string...

 console.log( String(5899).replace( /(?=\d{2}$)/, '.' ) );

but .toFixed makes a lot more intuitive sense, and so should probably be preferred.