At least one character at beginning and end of words

At least one character at beginning and end of words

[uzibalqa via Users list for the GNU Emacs text editor]

I want to match the sequence "at least one letter" then "ple" then "at least one letter". How would a regexp look like.?

RE: [External] : At least one character at beginning and end of words

[Drew Adams]

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> I want to match the sequence "at least one letter" then "ple" 
> then "at least one letter". How would a regexp look like.?

"[:alpha:]+ple[:alpha:]+"

I think you should spend some time reading the Elisp manual section on regexps.

https://www.gnu.org/software/emacs/manual/html_node/elisp/Regular-Expressions.html

And maybe read up elsewhere about regexps:

https://www.oreilly.com/library/view/mastering-regular-expressions/0596528124/

Then you can help others with their questions about regexps...

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Re: [External] : At least one character at beginning and end of words

[tomas]

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On Sun, Aug 14, 2022 at 11:43:10PM +0000, Drew Adams wrote:
> > I want to match the sequence "at least one letter" then "ple" 
> > then "at least one letter". How would a regexp look like.?
> 
> "[:alpha:]+ple[:alpha:]+"
> 
> I think you should spend some time reading the Elisp manual section on regexps.

I'd recommend that, too.

Cheers
-- 
t

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Re: [External] : At least one character at beginning and end of words

[uzibalqa]

------ Original Message -------
On Monday, August 15th, 2022 at 4:36 AM, <tomas@tuxteam.de> wrote:


> On Sun, Aug 14, 2022 at 11:43:10PM +0000, Drew Adams wrote:
>
> > > I want to match the sequence "at least one letter" then "ple"
> > > then "at least one letter". How would a regexp look like.?
> >
> > "[:alpha:]+ple[:alpha:]+"
> >
> > I think you should spend some time reading the Elisp manual section on regexps.

Although I have done

(insert (replace-regexp-in-string
	     "\\([:alpha:]+\\)ple\\([:alpha:]+\\)" "\\1p\\2" word))

word is being left intact.

Re: [External] : At least one character at beginning and end of words

[tomas]

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On Mon, Aug 15, 2022 at 09:25:50AM +0000, uzibalqa wrote:
> ------ Original Message -------
> On Monday, August 15th, 2022 at 4:36 AM, <tomas@tuxteam.de> wrote:
> 
> 
> > On Sun, Aug 14, 2022 at 11:43:10PM +0000, Drew Adams wrote:
> >
> > > > I want to match the sequence "at least one letter" then "ple"
> > > > then "at least one letter". How would a regexp look like.?
> > >
> > > "[:alpha:]+ple[:alpha:]+"
> > >
> > > I think you should spend some time reading the Elisp manual section on regexps.
> 
> Although I have done
> 
> (insert (replace-regexp-in-string
> 	     "\\([:alpha:]+\\)ple\\([:alpha:]+\\)" "\\1p\\2" word))
> 
> word is being left intact.

It's all in the manual, which you consistently ignore. Please do have
a look at it.

The [: ... :] character classes only go into the character class brackets
(i.e. [ ... ]). So you need two pairs of brackets, like so: [[:alpha:]].

Yes, it looks strange. But it starts making sense when you want to combine
things (e.g. alpha plus comma or dash: [[:alpha:],-])

Please, look into the manual. It takes some effort, but it's worth it.

Cheers
-- 
t

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Re: [External] : At least one character at beginning and end of words

[uzibalqa]

------- Original Message -------
On Monday, August 15th, 2022 at 9:48 AM, <tomas@tuxteam.de> wrote:


> On Mon, Aug 15, 2022 at 09:25:50AM +0000, uzibalqa wrote:
>
> > ------ Original Message -------
> > On Monday, August 15th, 2022 at 4:36 AM, tomas@tuxteam.de wrote:
> >
> > > On Sun, Aug 14, 2022 at 11:43:10PM +0000, Drew Adams wrote:
> > >
> > > > > I want to match the sequence "at least one letter" then "ple"
> > > > > then "at least one letter". How would a regexp look like.?
> > > >
> > > > "[:alpha:]+ple[:alpha:]+"
> > > >
> > > > I think you should spend some time reading the Elisp manual section on regexps.
> >
> > Although I have done
> >
> > (insert (replace-regexp-in-string
> > "\\([:alpha:]+\\)ple\\([:alpha:]+\\)" "\\1p\\2" word))
> >
> > word is being left intact.
>
>
> It's all in the manual, which you consistently ignore. Please do have
> a look at it.
>
> The [: ... :] character classes only go into the character class brackets
> (i.e. [ ... ]). So you need two pairs of brackets, like so: [[:alpha:]].
>
> Yes, it looks strange. But it starts making sense when you want to combine
> things (e.g. alpha plus comma or dash: [[:alpha:],-])

Yes, it makes sense.

> Please, look into the manual. It takes some effort, but it's worth it.
>
> Cheers
> --
> t