Re: regex-opt does not accept 'symbol as second arg?

[Lennart Borgman]

On Sat, Oct 11, 2008 at 2:10 PM, Nikolaj Schumacher <me@nschum.de> wrote:
> "Lennart Borgman" <lennart.borgman@gmail.com> wrote:
>
>> On Sat, Oct 11, 2008 at 12:02 PM, Xah <xahlee@gmail.com> wrote:
>>> the regexp-opt accept a second argument of "'word", but it doesn't
>>> accept "'symbol"?
>>>
>>> Shouldn't it?
>
> Sure, why not.
>
>> Would not the semantics be exactly the same?
>
> No, "\\<\\(\\w\\|\\s_+\\)+" (word delimiters) doesn't match the entire
> lisp symbol `-test'.

Ok, I see. There is \\_< for symbols, I never noticed that (I thought
that must be handled in the syntax table).

Then I think Xah is right.

>> But one thing I think would be useful is to be able to use numbers for
>> the PAREN argument to get an explicitly numbered regexp group back.
>
> Is it possible to modify the numbering at all?  If so, how?

See (info "(elisp) Regexp Backslash")

   `\(?NUM: ... \)'
         is the "explicitly numbered group" construct.

> regards,
> Nikolaj Schumacher
>