Transforming Captures in replace-regexp

Transforming Captures in replace-regexp

[Peter Danenberg]

     I'd  like  to  transform captured groups from `replace-
regexp', say, by iterating over the search results  with  an
arbitrary function.

     To take a trivial example, I'd like to run `capitalize-
region' on every \1 resulting from `\(.*\):'.

     Should I be interesting in something like Icicles?*

Best, Peter

-----------
  * http://www.emacswiki.org/cgi-bin/emacs-en/Icicles

Re: Transforming Captures in replace-regexp

[David Kastrup]

Peter Danenberg <pcd@wikitex.org> writes:

>> I'd like to transform captured groups from `replace-regexp', say,
>> by iterating over the search results with an arbitrary function.
>
>
>      The  answer  is  of course to use `\,', following by an
> arbitrary Lisp expression; read the source, Luke!

Works only with Emacs>21, namely pretests or development snapshots of
Emacs 22.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum

Re: Transforming Captures in replace-regexp

[David Kastrup]

Peter Danenberg <pcd@wikitex.org> writes:

>> Works only with Emacs>21, namely pretests or development snapshots
>> of Emacs 22.
>
>
>      I notice from the ChangeLog, David, that you're respon-
> sible for implementing `\,'; thanks: you've saved  at  least
> several hours of my life.

\, does not achieve anything that query-replace-regexp-eval could not
already do previously.  But discovering and using the latter felt, in
my opinion, too awkward for convenience.

You'll find that in the present implementation, \, actually
does nothing that a non-interactive call of query-replace-regexp could
not have achieved: it is implemented merely in the interactive form
collecting the arguments for query-replace-regexp, the actual call of
query-replace-regexp itself occuring with a Lisp form.  You can
look at it by using
C-x M-ESC
after a query-replace-regexp call using \,.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum

Re: Transforming Captures in replace-regexp

[Peter Danenberg]

> Works only with Emacs>21, namely pretests or development snapshots
> of Emacs 22.


     I notice from the ChangeLog, David, that you're respon-
sible for implementing `\,'; thanks: you've saved  at  least
several hours of my life.

Best, Peter

Re: Transforming Captures in replace-regexp

[Peter Danenberg]

> I'd like to transform captured groups from `replace-regexp', say,
> by iterating over the search results with an arbitrary function.


     The  answer  is  of course to use `\,', following by an
arbitrary Lisp expression; read the source, Luke!

Best, Peter

Re: Transforming Captures in replace-regexp

[Jim Ottaway]

On 17 Feb 2007, Peter Danenberg wrote:

>> I'd like to transform captured groups from `replace-regexp', say,
>> by iterating over the search results with an arbitrary function.
>
>
> The  answer  is  of course to use `\,', following by an
> arbitrary Lisp expression; read the source, Luke!

That works as long as you have Emacs 22 [I don't think it is in 21].

And you don't need to read the source

 C-h C-f RET query-replace-regexp 

gives all the details of the usage of \,.

I've found it an extremely useful addition to query-replace-regexp.

Regards,

-- 
Jim Ottaway