spliting string
Splitting a string and appending slash to it.
JavaScript
function splitInto(str) {
// var regex = new RegExp('.{' + len + '}|.{1,' + Number(len-1) + '}', 'g');
return str.match( /(\d{4})(\d{2})(\d{2})/ ).slice(1).join('/');
}
document.write.call(document, splitInto('20151007'));