string tokenizer? .. was .. RE: Filter a library from the list of libraries?

Steven,
I seem to be having a problem with $(libraries) because it hasn't been tokenized into a list, and is still all one string. 
So the set manipulation (like set.difference) isn't working.
I've been searching around and I can find explicit tokenization function? 
So suspect there is some simple syntax I've missed?

Many thanks,

Brian

> -----Original Message-----
> From: Boost-build [mailto:[email protected]] On Behalf Of
> Subject: Re: [Boost-build] Filter a library from the list of libraries?
> 
> AMDG
> 
> On 08/21/2018 02:49 PM, Kuhl, Brian via Boost-build wrote:
> > (Many thanks to Steven on answering my last question so quickly) ..
> > My next challenge is to remove the -ldl library from the list of libraries handed
> to the shared library linker a.k.a the link.dll action.
> > I'm trying to use MATCH for this with no success.
> >
> >
> >     local libraries = [ feature.get-values     <libraries>  : $(options) ] ;
> >     toolset.flags clang-vxworks.link     LIBRARIES    : $(libraries) ;
> >
> >     # link shared libraries without libld.a
> >     for local e in $(libraries)
> >     {
> >         local dll_libs = [ MATCH "-l(?!dl)\w+" : $(e) ] ;
> >     }
> >     toolset.flags clang-vxworks.link.dll DLL_LIBS : $(dll_libs) ;
> >
> >
> > Could someone identify my issue? (perhaps something in the regex needs
> escaping?) or perhaps suggest a better method to accomplish the same thing?
> >
> 
> "(?!)" is a perlism and is not supported by MATCH.
> 
> https://boostorg.github.io/build/manual/develop/index.html#jam.language.rule
> s.builtins.utility._match__
> 
> If you just want to remove an option, try [ set.difference $(libraries) : -ldl ]
> 
> In Christ,
> Steven Watanabe
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