Golang : Number Format - Simple Function For Thousand Separator Using Regex

package main

import (
	"fmt"
	"regexp"
)

func NumberFormat(num int) string {
	str := fmt.Sprintf("%d", num)
	re := regexp.MustCompile("(\\d+)(\\d{3})")
	for n := ""; n != str; {
		n = str
		str = re.ReplaceAllString(str, "$1,$2")
	}
	return str
}

func main() {

   fmt.Println(NumberFormat(1234567890))
   //will be produce : 1,234,567,890
}