References: <20120202102957.GB14566@csmvddesktop>
            <4F2A68F9.1010508@morningstar2.co.uk>
            <20120202111808.GA15304@csmvddesktop>
            <CANQYN6x2P2Mr+1LC5gCeUPHxTxRzmfVfPep8-oJ+VnW=5pvf1Q@mail.gmail.com> <20120202131844.GA16372@csmvddesktop>
            <20120202133153.GA16604@csmvddesktop>
            <CANQYN6wtf_6eoyTh6gcwotRYgCthr-mST34MCh7XYMe7uOwq1g@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.5.21 (2010-09-15)
Message-ID:  <20120203151218.GA30208@csmvddesktop>
Date:         Fri, 3 Feb 2012 15:12:18 +0000
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: dongen <dongen@CS.UCC.IE>
Subject: Re: Mapping Functions Versions for All and Some
To: LATEX-L@listserv.uni-heidelberg.de
In-Reply-To:  <CANQYN6wtf_6eoyTh6gcwotRYgCthr-mST34MCh7XYMe7uOwq1g@mail.gmail.com>
Precedence: list
Status: R

* Bruno Le Floch <blflatex@GMAIL.COM> [2012-02-02 10:57:16 -0500]:

Hi Bruno/all,


I'm having some problem with expansion. The following is a
contrived example of what's going wrong. I must be missing
something obvious.

    \expandafter
    \xdef\csname #1\endcsname ##1{%
        \regex_match:nnTF{o}{o}{{0}{0}}{{1}{1}}
    }

This defines some macro with the following definition:

    macro:#1->\regex_match:nnTF {o}{o}{{0}{0}}{{1}{1}}

I'd have thought the body of an xdef would be fully expanded
(unless you put an explicit \noexpand in front of an expression).

Why doesn't the \regex_match expand? If there's any documentation
I should read in order to understand this, please let me know where
to find it.

Lots of thanks in advance.

Regards,


Marc