References: <55DBB7F6.1070307@clear.net.nz>
            <55DABA1D.3050706@morningstar2.co.uk>
            <55DCFDF7.7080305@clear.net.nz>
            <9F80F164-248C-4E5D-B799-B42DE56A6016@gmail.com>
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101
            Thunderbird/38.2.0
MIME-Version: 1.0
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
Message-ID:  <55DC289F.90001@morningstar2.co.uk>
Date:         Tue, 25 Aug 2015 09:34:39 +0100
Reply-To: Mailing list for the LaTeX3 project
              <LATEX-L@LISTSERV.UNI-HEIDELBERG.DE>
Sender: Mailing list for the LaTeX3 project <LATEX-L@LISTSERV.UNI-HEIDELBERG.DE>
From: Joseph Wright <joseph.wright@MORNINGSTAR2.CO.UK>
Subject: Re: Catcode changes
To: LATEX-L@LISTSERV.UNI-HEIDELBERG.DE
In-Reply-To:  <9F80F164-248C-4E5D-B799-B42DE56A6016@gmail.com>
Precedence: list
Envelope-To: <rainer.schoepf@GMX.NET>
Status: R

On 25/08/2015 06:16, Will Robertson wrote:
> On 26 Aug 2015, at 09:14, aparsloe <aparsloe@CLEAR.NET.NZ> wrote:
>>
>> (1) I wanted to use \tl_replace_all:Nnn on a token list that might contain braced groups.
> 
> We might want to consider a "nesting" map function that essentially disregards brace groups. This could be used to define a new \tl_replace_nested:Nnn or similar for exactly this purpose. 
> 
> I'm fairly sure Bruno already has code that does nested mapping as part of his "tl" extensions... What do others think?

I guess I'd want to know a bit more about use cases. As I've said on
LaTeX-L, normally brace groups are an 'escape' mechanism from the
scanner, so I'm not sure I'd expect recursive replacement as a general
thing. I'm wondering if this is being used for something rather 'text
like', which might be handled by l3regex (slow but for a smaller number
of cases reasonable).

Joseph