[Caml-list] scanf question

["Milan Stanojević" <milanst@gmail.com>]

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)