Re: [Caml-list] scanf question

[Gabriel Scherer <gabriel.scherer@gmail.com>]

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This seems to be a regression caused by the reimplementation of format
strings in 4.02; some "stop after this character" indications are
supported, but some other fail (when they correspond to valid Format
specifications). Would you mind opening a but report (
http://caml.inria.fr/mantis/ )?

On Fri, Feb 20, 2015 at 8:28 PM, Milan Stanojević <milanst@gmail.com> wrote:

> I want to parse a bash like sequence string, for example
> "some-thing{1..20}", and extract the string before first { and then
> two numbers inside.
>
> I tried this first
> utop # Scanf.sscanf "some-thing{1..3}" "%s{%d..%d}" (fun s n1 n2 ->
> s,n1,n2);;
> Exception: End_of_file.
>
> Then I realized %s is special and needs scanning indication (character @).
>
> So I tried that but I get the same error
> utop # Scanf.sscanf "some-thing{1..3}" "%s@{%d..%d}" (fun s n1 n2 ->
> s,n1,n2);;
> Exception: End_of_file.
>
> But if I use some other character as end of string indication then it
> works.
> utop # Scanf.sscanf "some-thingI{1..3}" "%s@I{%d..%d}" (fun s n1 n2 ->
> s,n1,n2);;
> - : bytes * int * int = ("some-thing", 1, 3)
>
> It seems '{' is somehow special but I can't find anything in the docs
> about this.
> Can someone explain what is going on here?
>
> Thanks!
>
>
> p.s. At the end I solved my thing by using a range
>
> utop # Scanf.sscanf "some-thing{1..3}" "%[a-z-]{%d..%d}" (fun s n1 n2
> -> s,n1,n2);;
> - : bytes * int * int = ("some-thing", 1, 3)
>
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