String pattern help?

Just wondering, how could i conduct a string pattern that captures every 5 characters in a string (no matter that they are)? I know getting every character in a string is done like this:

for c in string.gmatch("hello*world*", ".") do
	print(c)
end

-- h
-- e
-- l
-- l
-- o
-- *
-- w
-- ...

But how would i make it so it would split the string every 5 characters? Including all kinds, like spaces, symbols, ect. So the output from above would instead look something like this:

-- hello      -- (cut at 5)
-- *worl     -- (cut at next 5)
-- d*            -- (cut from last 5, to end)

If someone knows how this could work, and is willing to share, I'd appreciate it very much. Thanks.