multiple patterns per clause?

Raimo Niskanen <>
Tue Aug 29 10:31:26 CEST 2006


You could group the clauses a bit:

        case L of
            [L1|_] when L1 =:= $f; L1 =:= $x ->
                ok;
            "abc"++_ ->
                ok
            _ ->  
                error
        end     

On Mon, Aug 28, 2006 at 10:47:38AM -0400, Yariv Sadan wrote:
> Hi,
> 
> Is it possible to have a single clause match multiple patterns in Erlang?
> 
> Specifically, I want to test if a list has a number of different
> prefixes, all of which would lead to the same expression.
> 
> This is what I want to write (pseudo code):
> 
> L = "foo",
> case L of
>  [$f|_];
>  [$x|_] ;
>  [$a, $b, $c | _] ->
>    ok;
>  _ ->
>    error
> end
> 
> I know the above is illegal, so what's the easiest way of doing
> something similar in Erlang?
> 
> Thanks in advance,
> Yariv

-- 

/ Raimo Niskanen, Erlang/OTP, Ericsson AB



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