Insert hyphens in JavaScript

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Quickest way would be with some regex:

Where n is the number

n.replace(/(\d{3})(\d{3})(\d{4})/, "$1-$2-$3");

Example: http://jsfiddle.net/jasongennaro/yXD7g/

var n = "1234567899";
console.log(n.replace(/(\d{3})(\d{3})(\d{4})/, "$1-$2-$3"));

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