How to add prefix before running interactive regexp search(isearch-forward-regexp)?

How to add prefix before running interactive regexp search(isearch-forward-regexp)?

[filebat Mark]

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Hi emacsers

I usually need to search only in the headings of org-mode file, with the
content of entries excluded.
For example, searching string of "org-mode", I used to type:
isearch-forward-regexp: ^\*.*org-mode, times and times again.

As you can see, I type the prefix of "^\*.*" many times, when performing
interactive regexp search.
I have checked isearch.el for some while, but I haven't find a clue to
define prefix before search.

Do you have any suggestions?

-- 
Thanks & Regards

Denny Zhang

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Re: How to add prefix before running interactive regexp search(isearch-forward-regexp)?

[Peter Dyballa]

Am 22.04.2010 um 16:47 schrieb filebat Mark:

> Do you have any suggestions?

Store that "prefix" in registers for easy insertion, re-use elder reg- 
exp's and edit them.

--
Greetings

   Pete

We are usually convinced more easily by reasons we have found  
ourselves than by those which have occurred to others.
				– Blaise Pascal

RE: How to add prefix before running interactive regexpsearch(isearch-forward-regexp)?

[Drew Adams]

> Store that "prefix" in registers for easy insertion

Or copy the string to the kill-ring and then yank it into Isearch using `M-y'.

Or copy it as the secondary selection and yank it using `C-M-y'. (You need
library second-sel.el for this.) The secondary selection doesn't get overwritten
when you update the clipboard or the kill ring.

http://www.emacswiki.org/emacs/SecondarySelection

Re: How to add prefix before running interactive regexp search(isearch-forward-regexp)?

[Juri Linkov]

> I usually need to search only in the headings of org-mode file, with the
> content of entries excluded.
> For example, searching string of "org-mode", I used to type:
> isearch-forward-regexp: ^\*.*org-mode, times and times again.
>
> As you can see, I type the prefix of "^\*.*" many times, when performing
> interactive regexp search.
> I have checked isearch.el for some while, but I haven't find a clue to
> define prefix before search.
>
> Do you have any suggestions?

(add-hook 'isearch-mode-hook
          (lambda ()
            (if (eq major-mode 'org-mode)
                (set (make-local-variable 'isearch-filter-predicate)
                     (lambda (beg end)
                       (save-excursion
                         (beginning-of-line)
                         (looking-at-p "^\\*"))))))
          nil t)

-- 
Juri Linkov
http://www.jurta.org/emacs/