using Javascript regular expression to split

gistfile1.txt

key="123 456 777777 32432 531 431431 531453 5315312 4312341 fdkljas asdkj 314 fdaslj 431lj"
var result = key.split(/(\w+\s\w+\s\w+\s\w+\s\w+\s)/gi)
for (var item in result){
  console.log(result[item])
}