On 20.07.2015 22:09, Ivan Gotovchits wrote:
> You need to load posix sublibrary:
>
>     #require "re.posix";;
>
> On Mon, Jul 20, 2015 at 4:00 PM, Mr. Herr <misterherr@freenet.de 
> <mailto:misterherr@freenet.de>> wrote:
>
>     Hi,
>
>     unexplainable behavior: module Re_posix causes an error "undefined global
>     Re_posix",
>     but the module is known.
>
>     Even stranger: when misspelling Re_posix the toplevel proposes Re_posix.
>
>     What is wrong?
>
>     /Str.
>
>     ----------------------------------------------------------------------------------
>     /opt/opam/4.02.2/lib/ocaml/unix.cma: loaded
>     # #require "re";;
>     /opt/opam/4.02.2/lib/bytes: added to search path
>     /opt/opam/4.02.2/lib/re: added to search path
>     /opt/opam/4.02.2/lib/re/re.cma: loaded
>     # let re_whitespace = Re_posix.compile_pat "[\t ]+" ;;
>     Error: Reference to undefined global `Re_posix'
>     # #show_module Re_posix;;
>     module Re_posix :
>       sig
>         exception Parse_error
>         exception Not_supported
>         type opt = [ `ICase | `Newline | `NoSub ]
>         val re : ?opts:opt list -> string -> Re.t
>         val compile : Re.t -> Re.re
>         val compile_pat : ?opts:opt list -> string -> Re.re
>       end
>     # let re_whitespace = Re_posixx.compile_pat "[\t ]+" ;;
>     Error: Unbound module Re_posixx
>     Hint: Did you mean Re_posix?
>
>
Okay, thank you all - five answers in the mailbox.

So there is not much to "/opt/opam/4.02.2/lib/re: added to search path"

/Str.