[External] : Regexp for matching (defun lines

[Heime <heimeborgia@protonmail.com>]

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On Thursday, August 1st, 2024 at 2:08 PM, Drew Adams <drew.adams@oracle.com> wrote:

> > > > > (concat
> > > > > "^\\s-("
> > > > > (regexp-opt...)
> > > > > t)
> > > > > "\\s-+\\(\\(\\sw\\|\\s_\\)+\\)")
> > > > 
> > > > I see that you use "\\sw". What is the advantage verses "[[:alnum:]-
> > > > _]"
> > > 
> > > No special advantage. You can include any other
> > > chars you want, so you can pick up, e.g.,
> > > 
> > > (defun foo!@$%^&*+={}/:42<>? ()
> > > (message "Hello"))
> > > 
> > > Perfectly legitimate, and none of those chars
> > > even require escaping.
> > 
> > Meaning that \\sw is superior to [[:alnum:]-_], right ?
> 
> 
> No.
> 
> \\sw means word-char syntax.
> [[:alnum:]-_] means alphanumeric- or symbol-char syntax.

\sw is equivalent to "[:word:]", that includes digits.  And [:alnum:] 
is alphabetic and numeric.  What is the difference ?