Question

I’m not an expert on regex and I need some help on formatting numbers.

This is what I have:

TheNumber = TheNumber.toString().split(/(?=(?:\d{3})+(?:\.|$))/g).join(",");

Basically, I want TheNumber to be formatted with commas to separate thousands and up to 3 decimal precision with a dot to indicate decimal if there are decimals. It should also work with negative numbers.

I’m not far only that for the moment

3234234.223512 becomes 3,234,234.223,512

Thanks for your help.

Answer 1

I found this Javascript library accounting.js

As mentioned in description.
Accounting.js is a tiny JavaScript library for number, money and currency formatting, with optional excel-style column rendering (to line up symbols and decimals). It’s lightweight, fully localisable and has zero dependencies.

It does the same as your requirements and even a little more.