bug#20806: 25.0.50; `string-match' is confused???

[Michael Heerdegen]

Vaidheeswaran C <vaidheeswaran.chinnaraju@gmail.com> writes:

> Debugger entered--Lisp error: (error "Regexp cannot match an empty
> string")
>   signal(error ("Regexp cannot match an empty string"))
>   error("Regexp cannot match an empty string")
>  [...]
>   command-execute(highlight-regexp)

AFAICT, you got this error because you entered an regexp to the
`highlight-regexp' prompt that the empty string is matched by.  Such a
regexp is rejected by hi-lock.  With other words, the error is raised by
intent in hi-lock.el.

I guess, theoretically this rejected case could be made working, but the
code would get a bit uglier and less effective then, and is easy to
avoid.

What's your use case?


Michael.