Re: Negative Lookahead Equivalent in emacs

[Emanuel Berg]

> I'm trying to write a regex that matches the
> last character of a sequence of
> non-whitespace characters '[^\n\r\t\f ]', or
> an empty line matching ^$.
>
> Thus: Hello World! --> "o" and "!" would be
> matched

I would probably use syntax classes [1] for
this, with numbered groups, as in this Elisp.
Regexps are hairy tho so some fiddling and
fine-tuning is expected:

    (when (re-search-forward
           "\\([[:graph:]]\\)[ \n]" (point-max) t)
      (goto-char (match-beginning 0))
      (message (match-string-no-properties 1)) )

Hello World!

[1] https://www.emacswiki.org/emacs/RegularExpression

-- 
underground experts united
http://user.it.uu.se/~embe8573