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On Tue, Jul 14, 2015 at 9:21 AM, John Hind <> wrote:
> I've just had another bout of wrestling with patterns, probably the most
> obscurantist part of Lua and the only bit I've never been able to learn and
> always have to get "Programming in Lua" off the shelf. Take the simple case
> of parsing a comma-separated list, the kludge I keep coming back to is
> concatenating a terminating comma onto the source string before applying the
> pattern:
>     ps = "1,22,33,4444"
>     ps = ps .. ","
>     for n in ps:gmatch("(%d+),") do
>         print(ls)
>     end

Why not:

for s in ('1,22,33,4444') : gmatch '%d+' do  print ( s )  end


for s, c in ('1,22,33,4444') : gmatch '(%d+)(,?)' do  print ( s, c )  end

If you need more than either of the above, have you tried LPeg?