String exploding

This function adds the ability to explode strings in Lua.

function string.explode(str, div)
    local o = {}
    while true do
        local pos = str:find(div)
        if not pos then
            o[#o+1] = str
            break
        end
        o[#o+1],s = s:sub(1,pos-1),s:sub(pos+1)
    end
    return o
end

Have an example:

tbl = string.explode("foo bar", " ")
print(tbl[1]) --> foo
-- since we added explode to the string table, we can also do this:
str = "foo bar"
tbl2 = str:explode(" ")
print(tbl2[2]) --> bar
-- to restore the original string, we can use Lua's table.concat:
original = table.concat(tbl, " ")
print(original) --> foo bar