Re: [External] : Use the characters "+" and "-" in regular expressions

[steve-humphreys@gmx.com]

> Sent: Friday, May 21, 2021 at 12:46 AM
> From: "Jean Louis" <bugs@gnu.support>
> To: steve-humphreys@gmx.com
> Cc: "help-gnu-emacs@gnu.org" <help-gnu-emacs@gnu.org>
> Subject: Re: [External] :  Use the characters "+" and "-" in regular expressions
>
> * steve-humphreys@gmx.com <steve-humphreys@gmx.com> [2021-05-20 13:41]:
> > Am seeing how to match strings of blank lines
> > 
> > But " +" does not do the job.  I know why, but how can one match strings of blanks?
> 
> [:blank:] is series of characters for that:
> 
> (string-match "[[:blank:]]" " ") ⇒ 0

Have done the following  (string-match "^[:blank:]$" s)

Because (string-match "[:blank:]" s) was matching sentences with space between words as well.


> Match new lines as blanks:
> 
> (string-match "[[:blank:]]" " 
> 
> ") ⇒ 0
> 
> There can be many various spaces, like EM SPACE: " "
> 
> Thus this will not work on EM SPACE:
> 
> (string-match " +" " ") ⇒ nil
> 
> But this will work:
> (string-match "[[:blank:]]" " ") ⇒ 0
> 
> 
> -- 
> Jean
> 
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