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Anchoring a RE in a string
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Doug Lewan  
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 More options Jun 8 2012, 2:48 pm
Newsgroups: gnu.emacs.help
From: Doug Lewan <do...@shubertticketing.com>
Date: Fri, 8 Jun 2012 18:48:52 +0000
Local: Fri, Jun 8 2012 2:48 pm
Subject: Anchoring a RE in a string
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Currently I'm trying to check the /beginning/ of a multi-line string with a regular expression.
The scenario looks like this:

(string-match "^\\s-+ABCD"
              "qwer\n    zxcv\n    ABCD")
                                            ^ Matches here.

I want it to fail because the beginning doesn't match.
I hadn't expected the anchor (^) to match inside the string.

I can't be the only one to have wanted to do this.
What's the right way.

Thanks.

,Douglas
Douglas Lewan
Shubert Ticketing
(201) 489-8600 ext 224


 
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Doug Lewan  
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 More options Jun 8 2012, 3:08 pm
Newsgroups: gnu.emacs.help
From: Doug Lewan <do...@shubertticketing.com>
Date: Fri, 8 Jun 2012 19:08:24 +0000
Local: Fri, Jun 8 2012 3:08 pm
Subject: RE: Anchoring a RE in a string
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I've found the /adequate/ solution.

(setq s (delete ?\n s))
(string-match "^\\s-+ABCD" s)

Still, is there no way of truly anchoring at the beginning of a string?


 
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jpkotta  
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 More options Jun 8 2012, 3:18 pm
Newsgroups: gnu.emacs.help
From: jpkotta <jpko...@gmail.com>
Date: Fri, 8 Jun 2012 12:18:45 -0700 (PDT)
Local: Fri, Jun 8 2012 3:18 pm
Subject: Re: Anchoring a RE in a string
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Use \\` instead of ^.  See "34.3.1.1 Special Characters in Regular Expressions" in the Elisp manual.

 
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jpkotta  
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 More options Jun 8 2012, 3:18 pm
Newsgroups: gnu.emacs.help
From: jpkotta <jpko...@gmail.com>
Date: Fri, 8 Jun 2012 12:18:45 -0700 (PDT)
Local: Fri, Jun 8 2012 3:18 pm
Subject: Re: Anchoring a RE in a string
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Use \\` instead of ^.  See "34.3.1.1 Special Characters in Regular Expressions" in the Elisp manual.

 
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Doug Lewan  
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 More options Jun 8 2012, 5:06 pm
Newsgroups: gnu.emacs.help
From: Doug Lewan <do...@shubertticketing.com>
Date: Fri, 8 Jun 2012 21:06:25 +0000
Local: Fri, Jun 8 2012 5:06 pm
Subject: RE: Anchoring a RE in a string
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\` -- empty string at the beginning of buffer

Fantastic!

In fact, I'd found my first use for \' just recently. I don't know why it didn't strike me.

I will never run out of things to learn in emacs. As a video game, I still feel like I'm on level 2.


 
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Philipp Haselwarter  
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 More options Jun 9 2012, 3:28 pm
Newsgroups: gnu.emacs.help
From: Philipp Haselwarter <phil...@haselwarter.org>
Date: Sat, 09 Jun 2012 21:28:22 +0200
Local: Sat, Jun 9 2012 3:28 pm
Subject: Re: Anchoring a RE in a string
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`rx' is cool when you're too lazy to look up special symbols

--
Philipp Haselwarter


 
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rusi  
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 More options Jun 10 2012, 1:38 am
Newsgroups: gnu.emacs.help
From: rusi <rustompm...@gmail.com>
Date: Sat, 9 Jun 2012 22:38:18 -0700 (PDT)
Local: Sun, Jun 10 2012 1:38 am
Subject: Re: Anchoring a RE in a string
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On Jun 10, 12:28 am, Philipp Haselwarter <phil...@haselwarter.org>
wrote:

> `rx' is cool when you're too lazy to look up special symbols

> --
> Philipp Haselwarter

Interesting!! Cant find an info page.

 
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Philipp Haselwarter  
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 More options Jun 10 2012, 3:06 am
Newsgroups: gnu.emacs.help
From: Philipp Haselwarter <phil...@haselwarter.org>
Date: Sun, 10 Jun 2012 09:06:16 +0200
Local: Sun, Jun 10 2012 3:06 am
Subject: Re: Anchoring a RE in a string
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On Sun, Jun 10 2012 07:38 (@1339306698), rusi wrote:
> On Jun 10, 12:28 am, Philipp Haselwarter <phil...@haselwarter.org>
> wrote:
>> `rx' is cool when you're too lazy to look up special symbols

>> --
>> Philipp Haselwarter

> Interesting!! Cant find an info page.

Unfortunately, its only mention in emacs or elisp info is Gerd
Moellmann's authorship notice: "[...] `rx.el', a regular expression
constructor. ".

Take a look at C-h f rx RET

--
Philipp Haselwarter


 
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Drew Adams  
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 More options Jun 10 2012, 10:34 am
Newsgroups: gnu.emacs.help
From: "Drew Adams" <drew.ad...@oracle.com>
Date: Sun, 10 Jun 2012 07:34:30 -0700
Local: Sun, Jun 10 2012 10:34 am
Subject: RE: Anchoring a RE in a string
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> Unfortunately, its only mention in emacs or elisp info is Gerd
> Moellmann's authorship notice: "[...] `rx.el', a regular expression
> constructor. ".  Take a look at C-h f rx RET

If you cannot find something in the manuals, try searching for it at EmacsWiki
(or Google after that).  Entering "rx" in the wiki search field shows this page
as the first search hit: http://emacswiki.org/emacs/rx.

(That of course is not intended to mean that something should not also be
mentioned in the manuals.  It's just intended to help you find information.  The
wiki is another resource, like help-gnu-em...@gnu.org.)


 
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