Regular Expression for formatting numbers in JavaScript

Question

I need to display a formatted number on a web page using JavaScript. I want to format it so that there are commas in the right places. How would I do this with a regular exp

Answer 1

After so much searching, I generate a regex which accepts all formats

(\d+[-, ,(]{0,3}\d+[-, ,(,)]{0,3}\d+[-, ,(,)]{0,3}\d+[)]{0,2})