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

[steve-humphreys]

> Sent: Friday, May 21, 2021 at 2:14 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 16:56]:
> 
> > > [:blank:] is series of characters for that:
> > > 
> > > (string-match "[[:blank:]]" " ") ⇒ 0
> > 
> > Have done the following  (string-match "^[:blank:]$" " ")
> > 
> > Because (string-match "[:blank:]" s) was matching sentences with
> > space between words as well.
> 
> Are you sure? As in that case the meaning of ^ is that it matches
> begin of line, while in [^[:blank:]] it match anything but non-blank
> and meaning of ^ is "not match" in that case.

I have settled with

  (string-match "^[:blank:]*$" s)

This would match only strings with spaces, not sentences with spaces.  What do 
you think?


 
> 
> -- 
> Jean
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