There's \processseparatedlist[<list>][<separator>]\command with an arbitrary <separator> other than a comma...

You should take a look at syst-aux.mkiv and syst-aux.mkxl to see more helpers:

https://source.contextgarden.net/tex/context/base/mkiv/syst-aux.mkxl

El vie, 12 de feb. de 2021 a la(s) 14:49, Angel M Alganza (ama@ugr.es) escribió:
Hi Jairo:

On Fri, Feb 12, 2021 at 01:50:58PM -0500, Jairo A. del Rio wrote:

> Hi, Ángel. Like this?

> \def\mylist{Fulano,Mengano,Sutano}
> \def\mycommand#1{#1\blank{\red Something here}\blank}
> \starttext
> \processcommacommand[\mylist]\mycommand
> \stoptext

Yes, exactly like this, thank you.  Now, I have the names writen like:

        Family Name, Name

So, is it possible to use a list separatd by something else than a
comma?  A semicolon, for example?  To test I've replaced those commas by
a colon and it works fine, but I'd rather have a comma, if possible.

Again, thank you so much!

Cheers,
Ángel
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