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Date:         Fri, 3 Feb 2012 12:30:11 +0000
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From: dongen <dongen@CS.UCC.IE>
Subject: Re: Mapping Functions Versions for All and Some
To: LATEX-L@listserv.uni-heidelberg.de
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Status: R

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

Hi Bruno,

: > : Now here is the question. What I'd like to know if there's an easy way
: > : for a substitution of the form
: > :   a[expression] -> \csname myA[expression]\endcsname
: 
: \regex_replace_all:nnN
:   { a \[ (.+?) \] } { \c{ myA \[ \1 \] } } \l_your_tl

Great. Thanks. That's very useful.

: or, if the names "a" and "myA" are actually stored in some variables
: (in particular, if they contain characters that may be unsafe in
: regular expressions), say, \l_array_name_tl and \l_rec_name_tl, you
: can use the \u escape sequence (specific to l3regex, not present in
: Perl or PCRE):
: 
: \regex_replace_all:nnN
:   { \u{l_array_name_tl} \[ (.+?) \] }
:   { \c{ \u{l_rec_name_tl} \[ \1 \] } } \l_your_tl

Thanks.

: Feel free to ask details about the syntax: I'm not happy with how it's
: explained in the doc. Here is a possible approach for parsing the

I have a few minor comments on the doc. I'll forward them to you
later because they're at home and I'm at work (for a change; I
usually work from home).

: If I understand correctly, you want to use regular expressions to
: parse that. I think it is possible. A starting point is as follows.
: I'm using \tl_replace_all whenever possible rather than the more
: powerful regex features, because the former is roughly 100 times
: faster.

That's useful to know.

: [ code ]

: I hope the first part of that email was easy enough; the second part
: probably wasn't :). I assume that you are going to post the final
: solution on TeX.sx?

Thanks. The code is a bit difficult for me at the moment because
I'm still getting used to expl3 and friends. I can see what you're
doing at the start. I'm using TeX pattern matching for that:-).

I will post my example to TeX.sx when I'm done. I've made some
simplifications which really simplify the overall implementation.
I think the end product will look nice.

Regards,


Marc