title: javascript split string at at two different indexes
body: <p>I have a credit card # for amex I.E. <strong>371449635398431</strong> that I'd like to split up into 3 parts <strong>3714 496353 98431</strong> - Is there an easy way to split a string up by predefined indexes (in this case 4 &amp; 10), possibly with a simple regex function?</p>