From: Andreas Politz <politza@fh-trier.de>
To: help-gnu-emacs@gnu.org
Subject: Re: Help with regexp
Date: Wed, 02 Dec 2009 14:31:21 +0100 [thread overview]
Message-ID: <87ocmhtsd2.fsf@fh-trier.de> (raw)
In-Reply-To: 87vdgpbtlp.fsf@ergodik.univ-brest.fr
harven <harven@free.fr> writes:
> Andreas Politz <politza@fh-trier.de> writes:
>
>
>> Things I (won't) miss most:
>>
>> - extreme backslasheritis
>> - no short aliases for important constructs :
>> digits,symbol-constituents,newline,space
>
> ??
I should have defined short as a synonym for a 2-character sequence.
The main idea here is conciseness.
>
> \sw word constituent. Same as \w.
> \s_ symbol constituent.
I guess I was involved with vim for a to long time, where \w matches chars in a
c identifier, my bad.
> \s- whitespace character. Same as [[:space:]]
>
> See the wiki for the full list
> http://www.emacswiki.org/emacs-en/RegularExpression
>
> In a string you can use \n to match a newline, \t to match a tab.
> That's the reason why you have to use \\ to match a backslash.
>
But I can't enter a constant string in the mini-buffer...
> You can of course define your own classes using the category mechanism.
> And there is a user-friendly syntax with the rx command.
>
> Finally, if you miss perl, just use it. The following command
> will search, replace with the perl engine.
>
> (defun my-perl (prefix start end code)
> "ask for a perl expression in the minibuffer. Execute with the region as input.
> By default, the result is put in a separate buffer.
> If an argument is given, replace the region with the output.
> The perl command is executed with the -ln switches."
> (interactive "P\nr\nsPerl : ")
> (shell-command-on-region start end
> (concat "perl -lne '" code "'")
> (if prefix '(nil t))))
>
> Examples
> List lines in the region that contain the string "string"
> M-x my-perl RET print if /string/ RET
>
> Replace in the region all e by E
> C-u M-x my-perl RET s/e/E/g;print RET
>
> Count the number of lines in the region
> M-x my-perl RET print $. if eof RET
That maybe a good workaround, thanks.
I guess my main complain would be the over-expressiveness. Be it in the
actual regexp, due to backslashes and most atoms being 3-5 characters
in length. Or in the replacement, due to missing zero-width matches.
-ap
next prev parent reply other threads:[~2009-12-02 13:31 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.11978.1259698881.2239.help-gnu-emacs@gnu.org>
2009-12-01 21:07 ` Help with regexp Pascal J. Bourguignon
2009-12-02 5:16 ` tomas
2009-12-02 6:03 ` Andreas Politz
2009-12-02 7:11 ` tomas
2009-12-02 8:14 ` Andreas Politz
2009-12-05 6:46 ` tomas
2009-12-02 7:18 ` suvayu ali
[not found] ` <mailman.12000.1259733814.2239.help-gnu-emacs@gnu.org>
2009-12-02 9:41 ` harven
2009-12-02 13:31 ` Andreas Politz [this message]
2009-12-02 16:05 ` Lennart Borgman
2009-12-02 16:56 ` Andreas Politz
2009-12-02 17:16 ` Lennart Borgman
[not found] ` <mailman.12039.1259774199.2239.help-gnu-emacs@gnu.org>
2009-12-02 20:00 ` harven
2009-12-02 17:01 ` Andreas Politz
[not found] ` <mailman.12029.1259760724.2239.help-gnu-emacs@gnu.org>
2009-12-02 14:16 ` Pascal J. Bourguignon
2009-12-02 6:36 ` Xavier Maillard
[not found] ` <mailman.12002.1259735748.2239.help-gnu-emacs@gnu.org>
2009-12-02 11:16 ` Pascal J. Bourguignon
[not found] ` <mailman.11999.1259731365.2239.help-gnu-emacs@gnu.org>
2009-12-03 3:48 ` Stefan Monnier
2009-12-02 15:37 ` Colin S. Miller
2009-12-01 20:21 Xavier Maillard
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