[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Help with regexp
From: |
Andreas Politz |
Subject: |
Re: Help with regexp |
Date: |
Wed, 02 Dec 2009 14:31:21 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) |
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
- Help with regexp, Xavier Maillard, 2009/12/01
- Message not available
- Re: Help with regexp, harven, 2009/12/02
- Re: Help with regexp,
Andreas Politz <=
- Re: Help with regexp, Lennart Borgman, 2009/12/02
- Re: Help with regexp, Andreas Politz, 2009/12/02
- Re: Help with regexp, Lennart Borgman, 2009/12/02
- Message not available
- Re: Help with regexp, harven, 2009/12/02
- Re: Help with regexp, Andreas Politz, 2009/12/02
- Message not available
- Re: Help with regexp, Pascal J. Bourguignon, 2009/12/02
Re: Help with regexp, Xavier Maillard, 2009/12/02
Message not available
Message not available
Re: Help with regexp, Colin S. Miller, 2009/12/02