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

[tomas]

On Wed, May 19, 2021 at 07:39:10PM +0200, steve-humphreys@gmx.com wrote:
> > Sent: Thursday, May 20, 2021 at 4:47 AM
> > From: "Yuri Khan" <yuri.v.khan@gmail.com>
> > To: steve-humphreys@gmx.com
> > Cc: "Skip Montanaro" <skip.montanaro@gmail.com>, "Help Gnu Emacs" 
> > <help-gnu-emacs@gnu.org>
> > Subject: Re: Use the characters "+" and "-" in regular expressions
> >
> > On Wed, 19 May 2021 at 23:26, <steve-humphreys@gmx.com> wrote:
> > >
> > >    I want to match a space followed by a series of "+" or "-" or "."
> > 
> > You forgot to tell us what you tried, and how it doesn’t do what you want.
> > 
> > (You probably also forgot to read the manual chapters (info "(emacs)
> > Regexps") and (info "(elisp) Regular Expressions").)
> I had tried
> 
> (string-match " [-\+\.]+" s)

But you forgot to read the manual, as Skip noted. Otherwise you would have
read that whithin the [], + and . are not special. Don't escape them.
But the - is special. Put it at the end.

So your bracket sub-expression should be [+.-].

Cheers
 - t

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