add trailing zeroes if a number is an integer in TypeScript

Question

i have this script that uses a Regex to format a number and show only 2 digits after the float point:

let value =9.0111;
var n = value.toString().match(/^-?\d+(?:\.\d{0,2})?/)[0];
console.log(n)
//Output: 9.01

how to show two zero digits after the float point if the let value is an integer?

like 9.00 ?

is there a way to do it using only the RegEx ?