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Depending on what you're doing, it might be better to use an iterator
with a generic for loop. The function you posted creates a table which
usually isn't desirable if the table is short lived.

If this would be useful:

for str in split(somestring, "pattern") do ... end

Then you might want to use this:

function split(str, delim)
  local oldf = 0;
  return function()
    local start;
    if oldf == -1 then return nil end;
    oldf, start = str:find(delim, oldf + 1) or -1, oldf;
    return str:sub(start + 1, oldf);


-Patrick Donnelly

"One of the lessons of history is that nothing is often a good thing
to do and always a clever thing to say."

-Will Durant