How can i split a binary in erlang

Question

What I want is, I think, relatively simple:

> Bin = <<\"Hello.world.howdy?\">>.
> split(Bin, \".\").
[<<\"Hello\">>, <<\"         


        

Answer 1

There is about 15% faster version of binary split working in R12B:

split2(Bin, Chars) ->
    split2(Chars, Bin, 0, []).

split2(Chars, Bin, Idx, Acc) ->
    case Bin of
        <> ->
            case lists:member(Char, Chars) of
                false ->
                    split2(Chars, Bin, Idx+1, Acc);
                true ->
                    split2(Chars, Tail, 0, [This|Acc])
            end;
        <> ->
            lists:reverse(Acc, [This])
    end.

If you are using R11B or older use archaelus version instead.

The above code is faster on std. BEAM bytecode only, not in HiPE, there are both almost same.

EDIT: Note this code obsoleted by new module binary since R14B. Use binary:split(Bin, <<".">>, [global]). instead.